55578997 has 2 divisors, whose sum is σ = 55578998. Its totient is φ = 55578996.

The previous prime is 55578989. The next prime is 55579031. The reversal of 55578997 is 79987555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41486481 + 14092516 = 6441^2 + 3754^2 .

It is a cyclic number.

It is not a de Polignac number, because 55578997 - 2³ = 55578989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55578917) 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 as a sum of consecutive naturals, namely, 27789498 + 27789499.

It is an arithmetic number, because the mean of its divisors is an integer number (27789499).

Almost surely, 2^55578997 is an apocalyptic number.

It is an amenable number.

55578997 is a deficient number, since it is larger than the sum of its proper divisors (1).

55578997 is an equidigital number, since it uses as much as digits as its factorization.

55578997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3969000, while the sum is 55.

The square root of 55578997 is about 7455.1322590548. The cubic root of 55578997 is about 381.6250741486.

The spelling of 55578997 in words is "fifty-five million, five hundred seventy-eight thousand, nine hundred ninety-seven".