51900909 has 4 divisors (see below), whose sum is σ = 69201216. Its totient is φ = 34600604.

The previous prime is 51900907. The next prime is 51900931. The reversal of 51900909 is 90900915.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51900909 - 2¹ = 51900907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51900909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51900907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8650149 + ... + 8650154.

It is an arithmetic number, because the mean of its divisors is an integer number (17300304).

Almost surely, 2^51900909 is an apocalyptic number.

It is an amenable number.

51900909 is a deficient number, since it is larger than the sum of its proper divisors (17300307).

51900909 is a wasteful number, since it uses less digits than its factorization.

51900909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17300306.

The product of its (nonzero) digits is 3645, while the sum is 33.

The square root of 51900909 is about 7204.2285499559. The cubic root of 51900909 is about 373.0138762935.

The spelling of 51900909 in words is "fifty-one million, nine hundred thousand, nine hundred nine".