51240131 has 8 divisors (see below), whose sum is σ = 54462720. Its totient is φ = 48070152.

The previous prime is 51240121. The next prime is 51240221. The reversal of 51240131 is 13104215.

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

It is a de Polignac number, because none of the positive numbers 2^k-51240131 is a prime.

It is a super-2 number, since 2×51240131² = 5251102049794322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51240121) 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, 11135 + ... + 15048.

It is an arithmetic number, because the mean of its divisors is an integer number (6807840).

Almost surely, 2^51240131 is an apocalyptic number.

51240131 is a deficient number, since it is larger than the sum of its proper divisors (3222589).

51240131 is a wasteful number, since it uses less digits than its factorization.

51240131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26305.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 51240131 is about 7158.2212175931. The cubic root of 51240131 is about 371.4240978117.

Adding to 51240131 its reverse (13104215), we get a palindrome (64344346).

The spelling of 51240131 in words is "fifty-one million, two hundred forty thousand, one hundred thirty-one".