10915991 has 2 divisors, whose sum is σ = 10915992. Its totient is φ = 10915990.

The previous prime is 10915987. The next prime is 10915997. The reversal of 10915991 is 19951901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10915991 - 2² = 10915987 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10915997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5457995 + 5457996.

It is an arithmetic number, because the mean of its divisors is an integer number (5457996).

Almost surely, 2^10915991 is an apocalyptic number.

10915991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10915991 is an equidigital number, since it uses as much as digits as its factorization.

10915991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3645, while the sum is 35.

The square root of 10915991 is about 3303.9356833934. The cubic root of 10915991 is about 221.8303969324.

The spelling of 10915991 in words is "ten million, nine hundred fifteen thousand, nine hundred ninety-one".