91139499 has 60 divisors (see below), whose sum is σ = 158741352. Its totient is φ = 51891840.

The previous prime is 91139453. The next prime is 91139507. The reversal of 91139499 is 99493119.

It is not a de Polignac number, because 91139499 - 2¹⁶ = 91073963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91139449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 166344 + ... + 166890.

Almost surely, 2^91139499 is an apocalyptic number.

91139499 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

91139499 is a deficient number, since it is larger than the sum of its proper divisors (67601853).

91139499 is a wasteful number, since it uses less digits than its factorization.

91139499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598 (or 578 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 91139499 is about 9546.7009484952. The cubic root of 91139499 is about 450.0238654010.

The spelling of 91139499 in words is "ninety-one million, one hundred thirty-nine thousand, four hundred ninety-nine".