51131090 has 32 divisors (see below), whose sum is σ = 100016640. Its totient is φ = 18748800.

The previous prime is 51131083. The next prime is 51131099. The reversal of 51131090 is 9013115.

It is a super-2 number, since 2×51131090² = 5228776729176200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51131099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1550 + ... + 10230.

It is an arithmetic number, because the mean of its divisors is an integer number (3125520).

Almost surely, 2^51131090 is an apocalyptic number.

51131090 is a deficient number, since it is larger than the sum of its proper divisors (48885550).

51131090 is a wasteful number, since it uses less digits than its factorization.

51131090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8738.

The product of its (nonzero) digits is 135, while the sum is 20.

The square root of 51131090 is about 7150.6006740693. The cubic root of 51131090 is about 371.1604423713.

The spelling of 51131090 in words is "fifty-one million, one hundred thirty-one thousand, ninety".