51081975 has 96 divisors (see below), whose sum is σ = 113088000. Its totient is φ = 22083840.

The previous prime is 51081973. The next prime is 51082019. The reversal of 51081975 is 57918015.

51081975 = 51³ + 52³ + ... + 120³.

It is not a de Polignac number, because 51081975 - 2¹ = 51081973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51081971) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 89491 + ... + 90059.

It is an arithmetic number, because the mean of its divisors is an integer number (1178000).

Almost surely, 2^51081975 is an apocalyptic number.

51081975 is an abundant number, since it is smaller than the sum of its proper divisors (62006025).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51081975 is a wasteful number, since it uses less digits than its factorization.

51081975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614 (or 603 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The square root of 51081975 is about 7147.1655220794. The cubic root of 51081975 is about 371.0415624155.

The spelling of 51081975 in words is "fifty-one million, eighty-one thousand, nine hundred seventy-five".