91000901 has 4 divisors (see below), whose sum is σ = 91026432. Its totient is φ = 90975372.

The previous prime is 91000867. The next prime is 91000919. The reversal of 91000901 is 10900019.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10900019 = 13 ⋅838463.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91000901 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 (91000981) 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 in 3 ways as a sum of consecutive naturals, for example, 6341 + ... + 14906.

It is an arithmetic number, because the mean of its divisors is an integer number (22756608).

Almost surely, 2^91000901 is an apocalyptic number.

It is an amenable number.

91000901 is a deficient number, since it is larger than the sum of its proper divisors (25531).

91000901 is a wasteful number, since it uses less digits than its factorization.

91000901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25530.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 91000901 is about 9539.4392392845. The cubic root of 91000901 is about 449.7956290081.

The spelling of 91000901 in words is "ninety-one million, nine hundred one", and thus it is an aban number.