55599897 has 4 divisors (see below), whose sum is σ = 74133200. Its totient is φ = 37066596.

The previous prime is 55599893. The next prime is 55599941. The reversal of 55599897 is 79899555.

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 not a de Polignac number, because 55599897 - 2² = 55599893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55599893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9266647 + ... + 9266652.

It is an arithmetic number, because the mean of its divisors is an integer number (18533300).

Almost surely, 2^55599897 is an apocalyptic number.

It is an amenable number.

55599897 is a deficient number, since it is larger than the sum of its proper divisors (18533303).

55599897 is a wasteful number, since it uses less digits than its factorization.

55599897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18533302.

The product of its digits is 5103000, while the sum is 57.

The square root of 55599897 is about 7456.5338462318. The cubic root of 55599897 is about 381.6729037540.

The spelling of 55599897 in words is "fifty-five million, five hundred ninety-nine thousand, eight hundred ninety-seven".