51311619 has 6 divisors (see below), whose sum is σ = 74116796. Its totient is φ = 34207740.

The previous prime is 51311591. The next prime is 51311669. The reversal of 51311619 is 91611315.

It is not a de Polignac number, because 51311619 - 2⁸ = 51311363 is a prime.

It is a super-2 number, since 2×51311619² = 5265764488802322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51311592 and 51311601.

It is not an unprimeable number, because it can be changed into a prime (51311669) 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, 2850637 + ... + 2850654.

Almost surely, 2^51311619 is an apocalyptic number.

51311619 is a deficient number, since it is larger than the sum of its proper divisors (22805177).

51311619 is a wasteful number, since it uses less digits than its factorization.

51311619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5701297 (or 5701294 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 51311619 is about 7163.2128964592. The cubic root of 51311619 is about 371.5967491218.

The spelling of 51311619 in words is "fifty-one million, three hundred eleven thousand, six hundred nineteen".