51927881 has 4 divisors (see below), whose sum is σ = 52702992. Its totient is φ = 51152772.

The previous prime is 51927857. The next prime is 51927899. The reversal of 51927881 is 18872915.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51927881 - 2²² = 47733577 is a prime.

It is a super-2 number, since 2×51927881² = 5393009650300322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51927181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387455 + ... + 387588.

It is an arithmetic number, because the mean of its divisors is an integer number (13175748).

Almost surely, 2^51927881 is an apocalyptic number.

It is an amenable number.

51927881 is a deficient number, since it is larger than the sum of its proper divisors (775111).

51927881 is an equidigital number, since it uses as much as digits as its factorization.

51927881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775110.

The product of its digits is 40320, while the sum is 41.

The square root of 51927881 is about 7206.1002629716. The cubic root of 51927881 is about 373.0784813787.

The spelling of 51927881 in words is "fifty-one million, nine hundred twenty-seven thousand, eight hundred eighty-one".