51115311 has 48 divisors (see below), whose sum is σ = 87010560. Its totient is φ = 28615680.

The previous prime is 51115297. The next prime is 51115327. The reversal of 51115311 is 11351115.

51115311 is a `hidden beast` number, since 511 + 153 + 1 + 1 = 666.

It is not a de Polignac number, because 51115311 - 2⁶ = 51115247 is a prime.

It is a super-2 number, since 2×51115311² = 5225550037253442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51115331) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61245 + ... + 62073.

It is an arithmetic number, because the mean of its divisors is an integer number (1812720).

Almost surely, 2^51115311 is an apocalyptic number.

51115311 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

51115311 is a deficient number, since it is larger than the sum of its proper divisors (35895249).

51115311 is a wasteful number, since it uses less digits than its factorization.

51115311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896 (or 893 counting only the distinct ones).

The product of its digits is 75, while the sum is 18.

The square root of 51115311 is about 7149.4972550523. The cubic root of 51115311 is about 371.1222585373.

Adding to 51115311 its reverse (11351115), we get a palindrome (62466426).

The spelling of 51115311 in words is "fifty-one million, one hundred fifteen thousand, three hundred eleven".