55317511 has 2 divisors, whose sum is σ = 55317512. Its totient is φ = 55317510.

The previous prime is 55317503. The next prime is 55317601. The reversal of 55317511 is 11571355.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55317511 - 2³ = 55317503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55317511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55317211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27658755 + 27658756.

It is an arithmetic number, because the mean of its divisors is an integer number (27658756).

Almost surely, 2^55317511 is an apocalyptic number.

55317511 is a deficient number, since it is larger than the sum of its proper divisors (1).

55317511 is an equidigital number, since it uses as much as digits as its factorization.

55317511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2625, while the sum is 28.

The square root of 55317511 is about 7437.5742685368. The cubic root of 55317511 is about 381.0256479543.

Adding to 55317511 its reverse (11571355), we get a palindrome (66888866).

The spelling of 55317511 in words is "fifty-five million, three hundred seventeen thousand, five hundred eleven".