91277983 has 4 divisors (see below), whose sum is σ = 91669968. Its totient is φ = 90886000.

The previous prime is 91277951. The next prime is 91277987. The reversal of 91277983 is 38977219.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38977219 = 97 ⋅401827.

It is a cyclic number.

It is not a de Polignac number, because 91277983 - 2⁵ = 91277951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91277987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195643 + ... + 196108.

It is an arithmetic number, because the mean of its divisors is an integer number (22917492).

Almost surely, 2^91277983 is an apocalyptic number.

91277983 is a deficient number, since it is larger than the sum of its proper divisors (391985).

91277983 is a wasteful number, since it uses less digits than its factorization.

91277983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391984.

The product of its digits is 190512, while the sum is 46.

The square root of 91277983 is about 9553.9511721591. The cubic root of 91277983 is about 450.2516830768.

The spelling of 91277983 in words is "ninety-one million, two hundred seventy-seven thousand, nine hundred eighty-three".