52157731 has 4 divisors (see below), whose sum is σ = 52175872. Its totient is φ = 52139592.

The previous prime is 52157719. The next prime is 52157741. The reversal of 52157731 is 13775125.

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

It is a cyclic number.

It is not a de Polignac number, because 52157731 - 2¹¹ = 52155683 is a prime.

It is a super-2 number, since 2×52157731² = 5440857806136722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 52157693 and 52157702.

It is not an unprimeable number, because it can be changed into a prime (52157741) 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, 3696 + ... + 10861.

It is an arithmetic number, because the mean of its divisors is an integer number (13043968).

Almost surely, 2^52157731 is an apocalyptic number.

52157731 is a deficient number, since it is larger than the sum of its proper divisors (18141).

52157731 is a wasteful number, since it uses less digits than its factorization.

52157731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18140.

The product of its digits is 7350, while the sum is 31.

The square root of 52157731 is about 7222.0309470398. The cubic root of 52157731 is about 373.6281275106.

The spelling of 52157731 in words is "fifty-two million, one hundred fifty-seven thousand, seven hundred thirty-one".