91986071 has 2 divisors, whose sum is σ = 91986072. Its totient is φ = 91986070.

The previous prime is 91986019. The next prime is 91986079. The reversal of 91986071 is 17068919.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91986071 - 2⁶ = 91986007 is a prime.

It is a super-2 number, since 2×91986071² = 16922874516034082, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91986079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45993035 + 45993036.

It is an arithmetic number, because the mean of its divisors is an integer number (45993036).

Almost surely, 2^91986071 is an apocalyptic number.

91986071 is a deficient number, since it is larger than the sum of its proper divisors (1).

91986071 is an equidigital number, since it uses as much as digits as its factorization.

91986071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 91986071 is about 9590.9369198218. The cubic root of 91986071 is about 451.4129596132.

The spelling of 91986071 in words is "ninety-one million, nine hundred eighty-six thousand, seventy-one".