53263781 has 4 divisors (see below), whose sum is σ = 54268812. Its totient is φ = 52258752.

The previous prime is 53263747. The next prime is 53263787. The reversal of 53263781 is 18736235.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34035556 + 19228225 = 5834^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 53263781 - 2²² = 49069477 is a prime.

It is a super-3 number, since 3×53263781³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53263787) 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, 502436 + ... + 502541.

It is an arithmetic number, because the mean of its divisors is an integer number (13567203).

Almost surely, 2^53263781 is an apocalyptic number.

It is an amenable number.

53263781 is a deficient number, since it is larger than the sum of its proper divisors (1005031).

53263781 is a wasteful number, since it uses less digits than its factorization.

53263781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005030.

The product of its digits is 30240, while the sum is 35.

The square root of 53263781 is about 7298.2039571390. The cubic root of 53263781 is about 376.2507122424.

The spelling of 53263781 in words is "fifty-three million, two hundred sixty-three thousand, seven hundred eighty-one".