55197409 has 4 divisors (see below), whose sum is σ = 55744020. Its totient is φ = 54650800.

The previous prime is 55197397. The next prime is 55197431. The reversal of 55197409 is 90479155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43191184 + 12006225 = 6572^2 + 3465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55197409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55197479) 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, 273154 + ... + 273355.

It is an arithmetic number, because the mean of its divisors is an integer number (13936005).

Almost surely, 2^55197409 is an apocalyptic number.

It is an amenable number.

55197409 is a deficient number, since it is larger than the sum of its proper divisors (546611).

55197409 is a wasteful number, since it uses less digits than its factorization.

55197409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546610.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 55197409 is about 7429.4958779180. The cubic root of 55197409 is about 380.7496949450.

The spelling of 55197409 in words is "fifty-five million, one hundred ninety-seven thousand, four hundred nine".