2215915591 has 2 divisors, whose sum is σ = 2215915592. Its totient is φ = 2215915590.

The previous prime is 2215915577. The next prime is 2215915601. The reversal of 2215915591 is 1955195122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2215915591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2215915501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1107957795 + 1107957796.

It is an arithmetic number, because the mean of its divisors is an integer number (1107957796).

Almost surely, 2^2215915591 is an apocalyptic number.

2215915591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2215915591 is an equidigital number, since it uses as much as digits as its factorization.

2215915591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500, while the sum is 40.

The square root of 2215915591 is about 47073.5126265292. The cubic root of 2215915591 is about 1303.7202294073.

The spelling of 2215915591 in words is "two billion, two hundred fifteen million, nine hundred fifteen thousand, five hundred ninety-one".