55923997 has 2 divisors, whose sum is σ = 55923998. Its totient is φ = 55923996.

The previous prime is 55923979. The next prime is 55924019. The reversal of 55923997 is 79932955.

Together with previous prime (55923979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47692836 + 8231161 = 6906^2 + 2869^2 .

It is a cyclic number.

It is not a de Polignac number, because 55923997 - 2⁷ = 55923869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55923997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55923697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27961998 + 27961999.

It is an arithmetic number, because the mean of its divisors is an integer number (27961999).

Almost surely, 2^55923997 is an apocalyptic number.

It is an amenable number.

55923997 is a deficient number, since it is larger than the sum of its proper divisors (1).

55923997 is an equidigital number, since it uses as much as digits as its factorization.

55923997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 765450, while the sum is 49.

The square root of 55923997 is about 7478.2348853189. The cubic root of 55923997 is about 382.4130766355.

The spelling of 55923997 in words is "fifty-five million, nine hundred twenty-three thousand, nine hundred ninety-seven".