51907881 has 8 divisors (see below), whose sum is σ = 70683264. Its totient is φ = 33868880.

The previous prime is 51907873. The next prime is 51907903. The reversal of 51907881 is 18870915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51907881 - 2³ = 51907873 is a prime.

It is a super-2 number, since 2×51907881² = 5388856219820322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51907841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183930 + ... + 184211.

It is an arithmetic number, because the mean of its divisors is an integer number (8835408).

Almost surely, 2^51907881 is an apocalyptic number.

It is an amenable number.

51907881 is a deficient number, since it is larger than the sum of its proper divisors (18775383).

51907881 is a wasteful number, since it uses less digits than its factorization.

51907881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368191.

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 51907881 is about 7204.7124161898. The cubic root of 51907881 is about 373.0305782252.

The spelling of 51907881 in words is "fifty-one million, nine hundred seven thousand, eight hundred eighty-one".