51057531 has 12 divisors (see below), whose sum is σ = 84285552. Its totient is φ = 29175696.

The previous prime is 51057529. The next prime is 51057593. The reversal of 51057531 is 13575015.

It is not a de Polignac number, because 51057531 - 2¹ = 51057529 is a prime.

It is a super-2 number, since 2×51057531² = 5213742943631922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51057495 and 51057504.

It is not an unprimeable number, because it can be changed into a prime (51057131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 405156 + ... + 405281.

It is an arithmetic number, because the mean of its divisors is an integer number (7023796).

Almost surely, 2^51057531 is an apocalyptic number.

51057531 is a deficient number, since it is larger than the sum of its proper divisors (33228021).

51057531 is a wasteful number, since it uses less digits than its factorization.

51057531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810450 (or 810447 counting only the distinct ones).

The product of its (nonzero) digits is 2625, while the sum is 27.

The square root of 51057531 is about 7145.4552689104. The cubic root of 51057531 is about 370.9823687564.

The spelling of 51057531 in words is "fifty-one million, fifty-seven thousand, five hundred thirty-one".