55804993 has 2 divisors, whose sum is σ = 55804994. Its totient is φ = 55804992.

The previous prime is 55804981. The next prime is 55805003. The reversal of 55804993 is 39940855.

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., 53333809 + 2471184 = 7303^2 + 1572^2 .

It is a cyclic number.

It is not a de Polignac number, because 55804993 - 2⁹ = 55804481 is a prime.

It is a super-2 number, since 2×55804993² = 6228394487460098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55804913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27902496 + 27902497.

It is an arithmetic number, because the mean of its divisors is an integer number (27902497).

Almost surely, 2^55804993 is an apocalyptic number.

It is an amenable number.

55804993 is a deficient number, since it is larger than the sum of its proper divisors (1).

55804993 is an equidigital number, since it uses as much as digits as its factorization.

55804993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 55804993 is about 7470.2739574931. The cubic root of 55804993 is about 382.1416308243.

The spelling of 55804993 in words is "fifty-five million, eight hundred four thousand, nine hundred ninety-three".