91986047 has 4 divisors (see below), whose sum is σ = 92657616. Its totient is φ = 91314480.

The previous prime is 91986019. The next prime is 91986071. The reversal of 91986047 is 74068919.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91986047 - 2¹⁸ = 91723903 is a prime.

It is a super-2 number, since 2×91986047² = 16922865685372418, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91985989 and 91986007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91986007) 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, 335579 + ... + 335852.

It is an arithmetic number, because the mean of its divisors is an integer number (23164404).

Almost surely, 2^91986047 is an apocalyptic number.

91986047 is a deficient number, since it is larger than the sum of its proper divisors (671569).

91986047 is a wasteful number, since it uses less digits than its factorization.

91986047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671568.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 91986047 is about 9590.9356686405. The cubic root of 91986047 is about 451.4129203539.

The spelling of 91986047 in words is "ninety-one million, nine hundred eighty-six thousand, forty-seven".