91000000995 has 32 divisors (see below), whose sum is σ = 156692024640. Its totient is φ = 44929597440.

The previous prime is 91000000991. The next prime is 91000001017. The reversal of 91000000995 is 59900000019.

It is not a de Polignac number, because 91000000995 - 2² = 91000000991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91000000991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2909550 + ... + 2940659.

It is an arithmetic number, because the mean of its divisors is an integer number (4896625770).

Almost surely, 2^91000000995 is an apocalyptic number.

91000000995 is a deficient number, since it is larger than the sum of its proper divisors (65692023645).

91000000995 is a wasteful number, since it uses less digits than its factorization.

91000000995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5850295.

The product of its (nonzero) digits is 3645, while the sum is 33.

The spelling of 91000000995 in words is "ninety-one billion, nine hundred ninety-five", and thus it is an aban number.