51337881 has 24 divisors (see below), whose sum is σ = 87889984. Its totient is φ = 29334960.

The previous prime is 51337877. The next prime is 51337883. The reversal of 51337881 is 18873315.

It is not a de Polignac number, because 51337881 - 2² = 51337877 is a prime.

It is a super-2 number, since 2×51337881² = 5271156051140322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51337883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13390 + ... + 16791.

Almost surely, 2^51337881 is an apocalyptic number.

It is an amenable number.

51337881 is a deficient number, since it is larger than the sum of its proper divisors (36552103).

51337881 is an equidigital number, since it uses as much as digits as its factorization.

51337881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30203 (or 30191 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 51337881 is about 7165.0457779417. The cubic root of 51337881 is about 371.6601344367.

The spelling of 51337881 in words is "fifty-one million, three hundred thirty-seven thousand, eight hundred eighty-one".