51017139 has 6 divisors (see below), whose sum is σ = 73691436. Its totient is φ = 34011420.

The previous prime is 51017129. The next prime is 51017143. The reversal of 51017139 is 93171015.

It is a happy number.

51017139 is a `hidden beast` number, since 510 + 17 + 139 = 666.

It is not a de Polignac number, because 51017139 - 2⁵ = 51017107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51017129) 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, 2834277 + ... + 2834294.

It is an arithmetic number, because the mean of its divisors is an integer number (12281906).

Almost surely, 2^51017139 is an apocalyptic number.

51017139 is a deficient number, since it is larger than the sum of its proper divisors (22674297).

51017139 is a wasteful number, since it uses less digits than its factorization.

51017139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5668577 (or 5668574 counting only the distinct ones).

The product of its (nonzero) digits is 945, while the sum is 27.

The square root of 51017139 is about 7142.6282977627. The cubic root of 51017139 is about 370.8845139589.

The spelling of 51017139 in words is "fifty-one million, seventeen thousand, one hundred thirty-nine".