51115555 has 16 divisors (see below), whose sum is σ = 62913024. Its totient is φ = 39850720.

The previous prime is 51115543. The next prime is 51115577. The reversal of 51115555 is 55551115.

It is not a de Polignac number, because 51115555 - 2⁵ = 51115523 is a prime.

It is a super-2 number, since 2×51115555² = 5225599925916050, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103860 + ... + 104350.

It is an arithmetic number, because the mean of its divisors is an integer number (3932064).

Almost surely, 2^51115555 is an apocalyptic number.

51115555 is a deficient number, since it is larger than the sum of its proper divisors (11797469).

51115555 is a wasteful number, since it uses less digits than its factorization.

51115555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986.

The product of its digits is 3125, while the sum is 28.

The square root of 51115555 is about 7149.5143191688. The cubic root of 51115555 is about 371.1228490563.

The spelling of 51115555 in words is "fifty-one million, one hundred fifteen thousand, five hundred fifty-five".