55615493 has 2 divisors, whose sum is σ = 55615494. Its totient is φ = 55615492.

The previous prime is 55615487. The next prime is 55615513. The reversal of 55615493 is 39451655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47100769 + 8514724 = 6863^2 + 2918^2 .

It is a cyclic number.

It is not a de Polignac number, because 55615493 - 2¹² = 55611397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55615423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27807746 + 27807747.

It is an arithmetic number, because the mean of its divisors is an integer number (27807747).

Almost surely, 2^55615493 is an apocalyptic number.

It is an amenable number.

55615493 is a deficient number, since it is larger than the sum of its proper divisors (1).

55615493 is an equidigital number, since it uses as much as digits as its factorization.

55615493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81000, while the sum is 38.

The square root of 55615493 is about 7457.5795671250. The cubic root of 55615493 is about 381.7085873580.

The spelling of 55615493 in words is "fifty-five million, six hundred fifteen thousand, four hundred ninety-three".