91009086039 has 24 divisors (see below), whose sum is σ = 138853924352. Its totient is φ = 57350054160.

The previous prime is 91009085983. The next prime is 91009086041. The reversal of 91009086039 is 93068090019.

It is not a de Polignac number, because 91009086039 - 2¹⁵ = 91009053271 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91009085985 and 91009086003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91009066039) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3780997 + ... + 3804990.

Almost surely, 2^91009086039 is an apocalyptic number.

91009086039 is a deficient number, since it is larger than the sum of its proper divisors (47844838313).

91009086039 is a wasteful number, since it uses less digits than its factorization.

91009086039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7586067 (or 7586064 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The spelling of 91009086039 in words is "ninety-one billion, nine million, eighty-six thousand, thirty-nine".