53247781 has 4 divisors (see below), whose sum is σ = 54042592. Its totient is φ = 52452972.

The previous prime is 53247713. The next prime is 53247787. The reversal of 53247781 is 18774235.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53247781 - 2⁹ = 53247269 is a prime.

It is a super-2 number, since 2×53247781² = 5670652362847922, 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 53247781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53247787) 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, 397305 + ... + 397438.

It is an arithmetic number, because the mean of its divisors is an integer number (13510648).

Almost surely, 2^53247781 is an apocalyptic number.

It is an amenable number.

53247781 is a deficient number, since it is larger than the sum of its proper divisors (794811).

53247781 is an equidigital number, since it uses as much as digits as its factorization.

53247781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794810.

The product of its digits is 47040, while the sum is 37.

The square root of 53247781 is about 7297.1077147045. The cubic root of 53247781 is about 376.2130342671.

The spelling of 53247781 in words is "fifty-three million, two hundred forty-seven thousand, seven hundred eighty-one".