55499557 has 2 divisors, whose sum is σ = 55499558. Its totient is φ = 55499556.

The previous prime is 55499539. The next prime is 55499573. The reversal of 55499557 is 75599455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48874081 + 6625476 = 6991^2 + 2574^2 .

It is a cyclic number.

It is not a de Polignac number, because 55499557 - 2²³ = 47110949 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55499557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55499357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27749778 + 27749779.

It is an arithmetic number, because the mean of its divisors is an integer number (27749779).

Almost surely, 2^55499557 is an apocalyptic number.

It is an amenable number.

55499557 is a deficient number, since it is larger than the sum of its proper divisors (1).

55499557 is an equidigital number, since it uses as much as digits as its factorization.

55499557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1417500, while the sum is 49.

The square root of 55499557 is about 7449.8024806031. The cubic root of 55499557 is about 381.4431663964.

The spelling of 55499557 in words is "fifty-five million, four hundred ninety-nine thousand, five hundred fifty-seven".