51900445 has 8 divisors (see below), whose sum is σ = 63134136. Its totient is φ = 40951296.

The previous prime is 51900421. The next prime is 51900449. The reversal of 51900445 is 54400915.

It can be written as a sum of positive squares in 4 ways, for example, as 22934521 + 28965924 = 4789^2 + 5382^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51900445 - 2¹⁵ = 51867677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51900449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70732 + ... + 71461.

It is an arithmetic number, because the mean of its divisors is an integer number (7891767).

Almost surely, 2^51900445 is an apocalyptic number.

It is an amenable number.

51900445 is a deficient number, since it is larger than the sum of its proper divisors (11233691).

51900445 is a wasteful number, since it uses less digits than its factorization.

51900445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142271.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 51900445 is about 7204.1963465747. The cubic root of 51900445 is about 373.0127646948.

The spelling of 51900445 in words is "fifty-one million, nine hundred thousand, four hundred forty-five".