51065919 has 6 divisors (see below), whose sum is σ = 73761896. Its totient is φ = 34043940.

The previous prime is 51065899. The next prime is 51065933. The reversal of 51065919 is 91956015.

It is not a de Polignac number, because 51065919 - 2⁵ = 51065887 is a prime.

It is a super-2 number, since 2×51065919² = 5215456166629122, 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 (51061919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2836987 + ... + 2837004.

Almost surely, 2^51065919 is an apocalyptic number.

51065919 is a deficient number, since it is larger than the sum of its proper divisors (22695977).

51065919 is a wasteful number, since it uses less digits than its factorization.

51065919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5673997 (or 5673994 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 36.

The square root of 51065919 is about 7146.0421913112. The cubic root of 51065919 is about 371.0026832896.

It can be divided in two parts, 51065 and 919, that added together give a square (51984 = 228²).

The spelling of 51065919 in words is "fifty-one million, sixty-five thousand, nine hundred nineteen".