91000007 has 12 divisors (see below), whose sum is σ = 107654760. Its totient is φ = 76675536.

The previous prime is 90999989. The next prime is 91000009. The reversal of 91000007 is 70000019.

It is not a de Polignac number, because 91000007 - 2¹² = 90995911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91000009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12848 + ... + 18629.

It is an arithmetic number, because the mean of its divisors is an integer number (8971230).

Almost surely, 2^91000007 is an apocalyptic number.

91000007 is a deficient number, since it is larger than the sum of its proper divisors (16654753).

91000007 is a wasteful number, since it uses less digits than its factorization.

91000007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31550 (or 31543 counting only the distinct ones).

The product of its (nonzero) digits is 63, while the sum is 17.

The square root of 91000007 is about 9539.3923810691. The cubic root of 91000007 is about 449.7941560607.

The spelling of 91000007 in words is "ninety-one million, seven", and thus it is an aban number and an uban number.