55909397 has 4 divisors (see below), whose sum is σ = 56221920. Its totient is φ = 55596876.

The previous prime is 55909387. The next prime is 55909409. The reversal of 55909397 is 79390955.

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 55909397 - 2⁶ = 55909333 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 (55909307) 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, 155993 + ... + 156350.

It is an arithmetic number, because the mean of its divisors is an integer number (14055480).

Almost surely, 2^55909397 is an apocalyptic number.

It is an amenable number.

55909397 is a deficient number, since it is larger than the sum of its proper divisors (312523).

55909397 is a wasteful number, since it uses less digits than its factorization.

55909397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312522.

The product of its (nonzero) digits is 382725, while the sum is 47.

The square root of 55909397 is about 7477.2586554164. The cubic root of 55909397 is about 382.3797950560.

The spelling of 55909397 in words is "fifty-five million, nine hundred nine thousand, three hundred ninety-seven".