55651597 has 4 divisors (see below), whose sum is σ = 55678876. Its totient is φ = 55624320.

The previous prime is 55651571. The next prime is 55651601. The reversal of 55651597 is 79515655.

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 24860196 + 30791401 = 4986^2 + 5549^2 .

It is a cyclic number.

It is not a de Polignac number, because 55651597 - 2¹⁹ = 55127309 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 (55651397) 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, 10308 + ... + 14749.

It is an arithmetic number, because the mean of its divisors is an integer number (13919719).

Almost surely, 2^55651597 is an apocalyptic number.

It is an amenable number.

55651597 is a deficient number, since it is larger than the sum of its proper divisors (27279).

55651597 is a wasteful number, since it uses less digits than its factorization.

55651597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27278.

The product of its digits is 236250, while the sum is 43.

The square root of 55651597 is about 7459.9997989276. Note that the first 3 decimals coincide. The cubic root of 55651597 is about 381.7911676191.

The spelling of 55651597 in words is "fifty-five million, six hundred fifty-one thousand, five hundred ninety-seven".