51993909 has 12 divisors (see below), whose sum is σ = 81929952. Its totient is φ = 31511400.

The previous prime is 51993883. The next prime is 51993911. The reversal of 51993909 is 90939915.

It is not a de Polignac number, because 51993909 - 2⁸ = 51993653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51993919) 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, 262497 + ... + 262694.

It is an arithmetic number, because the mean of its divisors is an integer number (6827496).

Almost surely, 2^51993909 is an apocalyptic number.

It is an amenable number.

51993909 is a deficient number, since it is larger than the sum of its proper divisors (29936043).

51993909 is a wasteful number, since it uses less digits than its factorization.

51993909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525208 (or 525205 counting only the distinct ones).

The product of its (nonzero) digits is 98415, while the sum is 45.

The square root of 51993909 is about 7210.6802036978. The cubic root of 51993909 is about 373.2365415707.

The spelling of 51993909 in words is "fifty-one million, nine hundred ninety-three thousand, nine hundred nine".