91000001038 has 16 divisors (see below), whose sum is σ = 137595150000. Its totient is φ = 45135747072.

The previous prime is 91000001017. The next prime is 91000001039. The reversal of 91000001038 is 83010000019.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91000001039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30613 + ... + 427711.

It is an arithmetic number, because the mean of its divisors is an integer number (8599696875).

Almost surely, 2^91000001038 is an apocalyptic number.

91000001038 is a deficient number, since it is larger than the sum of its proper divisors (46595148962).

91000001038 is a wasteful number, since it uses less digits than its factorization.

91000001038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398019.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 91000001038 in words is "ninety-one billion, one thousand, thirty-eight".