51131523 has 8 divisors (see below), whose sum is σ = 68476608. Its totient is φ = 33937064.

The previous prime is 51131501. The next prime is 51131537. The reversal of 51131523 is 32513115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51131523 - 2²¹ = 49034371 is a prime.

It is a super-2 number, since 2×51131523² = 5228865288599058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51131523.

It is not an unprimeable number, because it can be changed into a prime (51131543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36861 + ... + 38222.

It is an arithmetic number, because the mean of its divisors is an integer number (8559576).

Almost surely, 2^51131523 is an apocalyptic number.

51131523 is a deficient number, since it is larger than the sum of its proper divisors (17345085).

51131523 is a wasteful number, since it uses less digits than its factorization.

51131523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75313.

The product of its digits is 450, while the sum is 21.

The square root of 51131523 is about 7150.6309511819. The cubic root of 51131523 is about 371.1614900836.

Adding to 51131523 its reverse (32513115), we get a palindrome (83644638).

The spelling of 51131523 in words is "fifty-one million, one hundred thirty-one thousand, five hundred twenty-three".