91981414 has 16 divisors (see below), whose sum is σ = 159310368. Its totient is φ = 39013632.

The previous prime is 91981403. The next prime is 91981453. The reversal of 91981414 is 41418919.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32509 + ... + 35224.

It is an arithmetic number, because the mean of its divisors is an integer number (9956898).

Almost surely, 2^91981414 is an apocalyptic number.

91981414 is a deficient number, since it is larger than the sum of its proper divisors (67328954).

91981414 is a wasteful number, since it uses less digits than its factorization.

91981414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67839.

The product of its digits is 10368, while the sum is 37.

The square root of 91981414 is about 9590.6941354628. The cubic root of 91981414 is about 451.4053415553.

The spelling of 91981414 in words is "ninety-one million, nine hundred eighty-one thousand, four hundred fourteen".