55404997 has 2 divisors, whose sum is σ = 55404998. Its totient is φ = 55404996.

The previous prime is 55404977. The next prime is 55405067. The reversal of 55404997 is 79940455.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54257956 + 1147041 = 7366^2 + 1071^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55404997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55404977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27702498 + 27702499.

It is an arithmetic number, because the mean of its divisors is an integer number (27702499).

Almost surely, 2^55404997 is an apocalyptic number.

It is an amenable number.

55404997 is a deficient number, since it is larger than the sum of its proper divisors (1).

55404997 is an equidigital number, since it uses as much as digits as its factorization.

55404997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 55404997 is about 7443.4532980331. The cubic root of 55404997 is about 381.2264092901.

The spelling of 55404997 in words is "fifty-five million, four hundred four thousand, nine hundred ninety-seven".