91000000901 has 4 divisors (see below), whose sum is σ = 91002060204. Its totient is φ = 90997941600.

The previous prime is 91000000891. The next prime is 91000000921. The reversal of 91000000901 is 10900000019.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10131429025 + 80868571876 = 100655^2 + 284374^2 .

It is a cyclic number.

It is not a de Polignac number, because 91000000901 - 2³⁴ = 73820131717 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 (91000000921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 961880 + ... + 1052241.

It is an arithmetic number, because the mean of its divisors is an integer number (22750515051).

Almost surely, 2^91000000901 is an apocalyptic number.

It is an amenable number.

91000000901 is a deficient number, since it is larger than the sum of its proper divisors (2059303).

91000000901 is a wasteful number, since it uses less digits than its factorization.

91000000901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059302.

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

The spelling of 91000000901 in words is "ninety-one billion, nine hundred one", and thus it is an aban number.