51518090 has 16 divisors (see below), whose sum is σ = 99866088. Its totient is φ = 19022016.

The previous prime is 51518081. The next prime is 51518107. The reversal of 51518090 is 9081515.

It can be written as a sum of positive squares in 4 ways, for example, as 42915601 + 8602489 = 6551^2 + 2933^2 .

It is a super-2 number, since 2×51518090² = 5308227194496200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198017 + ... + 198276.

Almost surely, 2^51518090 is an apocalyptic number.

51518090 is a deficient number, since it is larger than the sum of its proper divisors (48347998).

51518090 is a wasteful number, since it uses less digits than its factorization.

51518090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396313.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 51518090 is about 7177.6103265641. The cubic root of 51518090 is about 372.0945004069.

The spelling of 51518090 in words is "fifty-one million, five hundred eighteen thousand, ninety".