51091902 has 24 divisors (see below), whose sum is σ = 117211536. Its totient is φ = 16028736.

The previous prime is 51091891. The next prime is 51091903. The reversal of 51091902 is 20919015.

It is a happy number.

It is a super-2 number, since 2×51091902² = 5220764899955208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51091903) 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, 83178 + ... + 83789.

It is an arithmetic number, because the mean of its divisors is an integer number (4883814).

Almost surely, 2^51091902 is an apocalyptic number.

51091902 is an abundant number, since it is smaller than the sum of its proper divisors (66119634).

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

51091902 is a wasteful number, since it uses less digits than its factorization.

51091902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166992 (or 166989 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 51091902 is about 7147.8599594564. The cubic root of 51091902 is about 371.0655962749.

The spelling of 51091902 in words is "fifty-one million, ninety-one thousand, nine hundred two".