51280031 has 16 divisors (see below), whose sum is σ = 59452800. Its totient is φ = 43740000.

The previous prime is 51280013. The next prime is 51280043. The reversal of 51280031 is 13008215.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51280031 is a prime.

It is a super-2 number, since 2×51280031² = 5259283158721922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51279985 and 51280012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51280001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21656 + ... + 23906.

It is an arithmetic number, because the mean of its divisors is an integer number (3715800).

Almost surely, 2^51280031 is an apocalyptic number.

51280031 is the 3203-rd centered decagonal number.

51280031 is a deficient number, since it is larger than the sum of its proper divisors (8172769).

51280031 is a wasteful number, since it uses less digits than its factorization.

51280031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 51280031 is about 7161.0076804874. The cubic root of 51280031 is about 371.5204804465.

Adding to 51280031 its reverse (13008215), we get a palindrome (64288246).

It can be divided in two parts, 51 and 280031, that added together give a palindrome (280082).

The spelling of 51280031 in words is "fifty-one million, two hundred eighty thousand, thirty-one".