55921597 has 2 divisors, whose sum is σ = 55921598. Its totient is φ = 55921596.

The previous prime is 55921573. The next prime is 55921601. The reversal of 55921597 is 79512955.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43112356 + 12809241 = 6566^2 + 3579^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55921597 is a prime.

It is a super-2 number, since 2×55921597² = 6254450022060818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55924597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27960798 + 27960799.

It is an arithmetic number, because the mean of its divisors is an integer number (27960799).

Almost surely, 2^55921597 is an apocalyptic number.

It is an amenable number.

55921597 is a deficient number, since it is larger than the sum of its proper divisors (1).

55921597 is an equidigital number, since it uses as much as digits as its factorization.

55921597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141750, while the sum is 43.

The square root of 55921597 is about 7478.0744179234. The cubic root of 55921597 is about 382.4076060888.

The spelling of 55921597 in words is "fifty-five million, nine hundred twenty-one thousand, five hundred ninety-seven".