55637609 has 2 divisors, whose sum is σ = 55637610. Its totient is φ = 55637608.

The previous prime is 55637597. The next prime is 55637623. The reversal of 55637609 is 90673655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38440000 + 17197609 = 6200^2 + 4147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55637609 is a prime.

It is not a weakly prime, because it can be changed into another prime (55637009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27818804 + 27818805.

It is an arithmetic number, because the mean of its divisors is an integer number (27818805).

Almost surely, 2^55637609 is an apocalyptic number.

It is an amenable number.

55637609 is a deficient number, since it is larger than the sum of its proper divisors (1).

55637609 is an equidigital number, since it uses as much as digits as its factorization.

55637609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 41.

The square root of 55637609 is about 7459.0622064707. The cubic root of 55637609 is about 381.7591772681.

The spelling of 55637609 in words is "fifty-five million, six hundred thirty-seven thousand, six hundred nine".