91007793 has 10 divisors (see below), whose sum is σ = 135950034. Its totient is φ = 60671808.

The previous prime is 91007789. The next prime is 91007797. The reversal of 91007793 is 39770019.

It is an interprime number because it is at equal distance from previous prime (91007789) and next prime (91007797).

It can be written as a sum of positive squares in only one way, i.e., 54863649 + 36144144 = 7407^2 + 6012^2 .

It is not a de Polignac number, because 91007793 - 2² = 91007789 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91007797) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 561696 + ... + 561857.

Almost surely, 2^91007793 is an apocalyptic number.

It is an amenable number.

91007793 is a deficient number, since it is larger than the sum of its proper divisors (44942241).

91007793 is a wasteful number, since it uses less digits than its factorization.

91007793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123565 (or 1123556 counting only the distinct ones).

The product of its (nonzero) digits is 11907, while the sum is 36.

The square root of 91007793 is about 9539.8004696115. The cubic root of 91007793 is about 449.8069838891.

The spelling of 91007793 in words is "ninety-one million, seven thousand, seven hundred ninety-three".