2015560991 has 2 divisors, whose sum is σ = 2015560992. Its totient is φ = 2015560990.

The previous prime is 2015560979. The next prime is 2015561011. The reversal of 2015560991 is 1990655102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2015560991 is a prime.

It is a super-2 number, since 2×2015560991² = 8124972216881804162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2015560091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1007780495 + 1007780496.

It is an arithmetic number, because the mean of its divisors is an integer number (1007780496).

Almost surely, 2^2015560991 is an apocalyptic number.

2015560991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2015560991 is an equidigital number, since it uses as much as digits as its factorization.

2015560991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 38.

The square root of 2015560991 is about 44894.9996213387. Note that the first 3 decimals coincide. The cubic root of 2015560991 is about 1263.1802151657.

The spelling of 2015560991 in words is "two billion, fifteen million, five hundred sixty thousand, nine hundred ninety-one".