51081885 has 24 divisors (see below), whose sum is σ = 88946520. Its totient is φ = 27119232.

The previous prime is 51081851. The next prime is 51081911. The reversal of 51081885 is 58818015.

It can be written as a sum of positive squares in 4 ways, for example, as 24980004 + 26101881 = 4998^2 + 5109^2 .

It is not a de Polignac number, because 51081885 - 2²⁰ = 50033309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7827 + ... + 12783.

It is an arithmetic number, because the mean of its divisors is an integer number (3706105).

Almost surely, 2^51081885 is an apocalyptic number.

It is an amenable number.

51081885 is a deficient number, since it is larger than the sum of its proper divisors (37864635).

51081885 is a wasteful number, since it uses less digits than its factorization.

51081885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5197 (or 5194 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 36.

The square root of 51081885 is about 7147.1592258743. The cubic root of 51081885 is about 371.0413445059.

The spelling of 51081885 in words is "fifty-one million, eighty-one thousand, eight hundred eighty-five".