53909997 has 4 divisors (see below), whose sum is σ = 71880000. Its totient is φ = 35939996.

The previous prime is 53909993. The next prime is 53910007. The reversal of 53909997 is 79990935.

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 53909997 - 2² = 53909993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53909993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8984997 + ... + 8985002.

It is an arithmetic number, because the mean of its divisors is an integer number (17970000).

Almost surely, 2^53909997 is an apocalyptic number.

It is an amenable number.

53909997 is a deficient number, since it is larger than the sum of its proper divisors (17970003).

53909997 is a wasteful number, since it uses less digits than its factorization.

53909997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17970002.

The product of its (nonzero) digits is 688905, while the sum is 51.

The square root of 53909997 is about 7342.3427460178. The cubic root of 53909997 is about 377.7662043520.

The spelling of 53909997 in words is "fifty-three million, nine hundred nine thousand, nine hundred ninety-seven".