51277881 has 8 divisors (see below), whose sum is σ = 69491584. Its totient is φ = 33624720.

The previous prime is 51277859. The next prime is 51277883. The reversal of 51277881 is 18877215.

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

It is not a de Polignac number, because 51277881 - 2⁶ = 51277817 is a prime.

It is a super-2 number, since 2×51277881² = 5258842159700322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51277883) 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, 139921 + ... + 140286.

It is an arithmetic number, because the mean of its divisors is an integer number (8686448).

Almost surely, 2^51277881 is an apocalyptic number.

It is an amenable number.

51277881 is a deficient number, since it is larger than the sum of its proper divisors (18213703).

51277881 is a wasteful number, since it uses less digits than its factorization.

51277881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280271.

The product of its digits is 31360, while the sum is 39.

The square root of 51277881 is about 7160.8575603764. The cubic root of 51277881 is about 371.5152881707.

The spelling of 51277881 in words is "fifty-one million, two hundred seventy-seven thousand, eight hundred eighty-one".