51911139 has 12 divisors (see below), whose sum is σ = 80515464. Its totient is φ = 29663424.

The previous prime is 51911129. The next prime is 51911213. The reversal of 51911139 is 93111915.

It is not a de Polignac number, because 51911139 - 2⁵ = 51911107 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (51911129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176422 + ... + 176715.

It is an arithmetic number, because the mean of its divisors is an integer number (6709622).

Almost surely, 2^51911139 is an apocalyptic number.

51911139 is a deficient number, since it is larger than the sum of its proper divisors (28604325).

51911139 is a wasteful number, since it uses less digits than its factorization.

51911139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353154 (or 353147 counting only the distinct ones).

The product of its digits is 1215, while the sum is 30.

The square root of 51911139 is about 7204.9385146578. The cubic root of 51911139 is about 373.0383824878.

The spelling of 51911139 in words is "fifty-one million, nine hundred eleven thousand, one hundred thirty-nine".