52313981 has 4 divisors (see below), whose sum is σ = 55391292. Its totient is φ = 49236672.

The previous prime is 52313977. The next prime is 52314013. The reversal of 52313981 is 18931325.

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 36711481 + 15602500 = 6059^2 + 3950^2 .

It is a cyclic number.

It is not a de Polignac number, because 52313981 - 2² = 52313977 is a prime.

It is a super-2 number, since 2×52313981² = 5473505216136722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52313951) 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, 1538630 + ... + 1538663.

It is an arithmetic number, because the mean of its divisors is an integer number (13847823).

Almost surely, 2^52313981 is an apocalyptic number.

It is an amenable number.

52313981 is a deficient number, since it is larger than the sum of its proper divisors (3077311).

52313981 is a wasteful number, since it uses less digits than its factorization.

52313981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3077310.

The product of its digits is 6480, while the sum is 32.

The square root of 52313981 is about 7232.8404517174. The cubic root of 52313981 is about 374.0008507516. Note that the first 3 decimals are identical.

The spelling of 52313981 in words is "fifty-two million, three hundred thirteen thousand, nine hundred eighty-one".