51645925 has 12 divisors (see below), whose sum is σ = 66826080. Its totient is φ = 39519920.

The previous prime is 51645911. The next prime is 51645931. The reversal of 51645925 is 52954615.

It is not a de Polignac number, because 51645925 - 2⁹ = 51645413 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44335 + ... + 45484.

It is an arithmetic number, because the mean of its divisors is an integer number (5568840).

Almost surely, 2^51645925 is an apocalyptic number.

It is an amenable number.

51645925 is a deficient number, since it is larger than the sum of its proper divisors (15180155).

51645925 is a wasteful number, since it uses less digits than its factorization.

51645925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89852 (or 89847 counting only the distinct ones).

The product of its digits is 54000, while the sum is 37.

The square root of 51645925 is about 7186.5099318097. The cubic root of 51645925 is about 372.4020131738.

The spelling of 51645925 in words is "fifty-one million, six hundred forty-five thousand, nine hundred twenty-five".