91949141889 has 24 divisors (see below), whose sum is σ = 144900354144. Its totient is φ = 55722600000.

The previous prime is 91949141839. The next prime is 91949141909. The reversal of 91949141889 is 98814194919.

It is a happy number.

It is not a de Polignac number, because 91949141889 - 2⁹ = 91949141377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91949141839) 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, 1777389 + ... + 1828389.

It is an arithmetic number, because the mean of its divisors is an integer number (6037514756).

Almost surely, 2^91949141889 is an apocalyptic number.

91949141889 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

91949141889 is a deficient number, since it is larger than the sum of its proper divisors (52951212255).

91949141889 is a wasteful number, since it uses less digits than its factorization.

91949141889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69229 (or 69226 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 63.

The spelling of 91949141889 in words is "ninety-one billion, nine hundred forty-nine million, one hundred forty-one thousand, eight hundred eighty-nine".