51312919 has 16 divisors (see below), whose sum is σ = 64238400. Its totient is φ = 39965184.

The previous prime is 51312913. The next prime is 51312929. The reversal of 51312919 is 91921315.

It is a happy number.

It is not a de Polignac number, because 51312919 - 2⁵ = 51312887 is a prime.

It is a super-2 number, since 2×51312919² = 5266031312601122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51312913) 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, 3984 + ... + 10885.

It is an arithmetic number, because the mean of its divisors is an integer number (4014900).

Almost surely, 2^51312919 is an apocalyptic number.

51312919 is a deficient number, since it is larger than the sum of its proper divisors (12925481).

51312919 is a wasteful number, since it uses less digits than its factorization.

51312919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14922.

The product of its digits is 2430, while the sum is 31.

The square root of 51312919 is about 7163.3036372892. The cubic root of 51312919 is about 371.5998872784.

The spelling of 51312919 in words is "fifty-one million, three hundred twelve thousand, nine hundred nineteen".