91977429 has 12 divisors (see below), whose sum is σ = 130276064. Its totient is φ = 57710784.

The previous prime is 91977407. The next prime is 91977443. The reversal of 91977429 is 92477919.

It is a happy number.

It is not a de Polignac number, because 91977429 - 2⁵ = 91977397 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 (91977229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52177 + ... + 53910.

Almost surely, 2^91977429 is an apocalyptic number.

It is an amenable number.

91977429 is a deficient number, since it is larger than the sum of its proper divisors (38298635).

91977429 is a wasteful number, since it uses less digits than its factorization.

91977429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106124 (or 106107 counting only the distinct ones).

The product of its digits is 285768, while the sum is 48.

The square root of 91977429 is about 9590.4863797411. The cubic root of 91977429 is about 451.3988225707.

The spelling of 91977429 in words is "ninety-one million, nine hundred seventy-seven thousand, four hundred twenty-nine".