51008881 has 12 divisors (see below), whose sum is σ = 64078336. Its totient is φ = 39746520.

The previous prime is 51008873. The next prime is 51008887. The reversal of 51008881 is 18880015.

It is a happy number.

It is not a de Polignac number, because 51008881 - 2³ = 51008873 is a prime.

It is a super-2 number, since 2×51008881² = 5203811881744322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51008887) 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, 29265 + ... + 30958.

Almost surely, 2^51008881 is an apocalyptic number.

It is an amenable number.

51008881 is a deficient number, since it is larger than the sum of its proper divisors (13069455).

51008881 is a wasteful number, since it uses less digits than its factorization.

51008881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60252 (or 60241 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 31.

The square root of 51008881 is about 7142.0501958471. The cubic root of 51008881 is about 370.8645015366.

Adding to 51008881 its reverse (18880015), we get a palindrome (69888896).

It can be divided in two parts, 5 and 1008881, that multiplied together give a palindrome (5044405).

The spelling of 51008881 in words is "fifty-one million, eight thousand, eight hundred eighty-one".