53364781 has 4 divisors (see below), whose sum is σ = 53463964. Its totient is φ = 53265600.

The previous prime is 53364769. The next prime is 53364793. The reversal of 53364781 is 18746335.

53364781 = 5165² + 5166².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18746335 = 5 ⋅3749267.

It is an interprime number because it is at equal distance from previous prime (53364769) and next prime (53364793).

It can be written as a sum of positive squares in 2 ways, for example, as 26687556 + 26677225 = 5166^2 + 5165^2 .

It is a cyclic number.

It is not a de Polignac number, because 53364781 - 2⁷ = 53364653 is a prime.

It is a super-2 number, since 2×53364781² = 5695599702355922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53364781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53364721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48780 + ... + 49861.

It is an arithmetic number, because the mean of its divisors is an integer number (13365991).

Almost surely, 2^53364781 is an apocalyptic number.

53364781 is the 5166-th centered square number.

It is an amenable number.

53364781 is a deficient number, since it is larger than the sum of its proper divisors (99183).

53364781 is an equidigital number, since it uses as much as digits as its factorization.

53364781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99182.

The product of its digits is 60480, while the sum is 37.

The square root of 53364781 is about 7305.1201906608. The cubic root of 53364781 is about 376.4883804843.

It can be divided in two parts, 53364 and 781, that added together give a palindrome (54145).

The spelling of 53364781 in words is "fifty-three million, three hundred sixty-four thousand, seven hundred eighty-one".