5591124521 has 2 divisors, whose sum is σ = 5591124522. Its totient is φ = 5591124520.

The previous prime is 5591124491. The next prime is 5591124587. The reversal of 5591124521 is 1254211955.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5518261225 + 72863296 = 74285^2 + 8536^2 .

It is a cyclic number.

It is not a de Polignac number, because 5591124521 - 2²⁶ = 5524015657 is a prime.

It is not a weakly prime, because it can be changed into another prime (5591124221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2795562260 + 2795562261.

It is an arithmetic number, because the mean of its divisors is an integer number (2795562261).

Almost surely, 2^5591124521 is an apocalyptic number.

It is an amenable number.

5591124521 is a deficient number, since it is larger than the sum of its proper divisors (1).

5591124521 is an equidigital number, since it uses as much as digits as its factorization.

5591124521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 35.

The square root of 5591124521 is about 74773.8224313830. The cubic root of 5591124521 is about 1774.8693439237.

The spelling of 5591124521 in words is "five billion, five hundred ninety-one million, one hundred twenty-four thousand, five hundred twenty-one".