91000000994 has 16 divisors (see below), whose sum is σ = 156066525888. Its totient is φ = 38983369392.

The previous prime is 91000000991. The next prime is 91000001017. The reversal of 91000000994 is 49900000019.

It is a self number, because there is not a number n which added to its sum of digits gives 91000000994.

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 7 ways as a sum of consecutive naturals, for example, 1351889 + ... + 1417604.

It is an arithmetic number, because the mean of its divisors is an integer number (9754157868).

Almost surely, 2^91000000994 is an apocalyptic number.

91000000994 is a deficient number, since it is larger than the sum of its proper divisors (65066524894).

91000000994 is a wasteful number, since it uses less digits than its factorization.

91000000994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771849.

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 91000000994 in words is "ninety-one billion, nine hundred ninety-four", and thus it is an aban number.