91946391 has 8 divisors (see below), whose sum is σ = 122905584. Its totient is φ = 61142400.

The previous prime is 91946381. The next prime is 91946399. The reversal of 91946391 is 19364919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91946391 - 2⁹ = 91945879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91946399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37410 + ... + 39791.

It is an arithmetic number, because the mean of its divisors is an integer number (15363198).

Almost surely, 2^91946391 is an apocalyptic number.

91946391 is a deficient number, since it is larger than the sum of its proper divisors (30959193).

91946391 is a wasteful number, since it uses less digits than its factorization.

91946391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77601.

The product of its digits is 52488, while the sum is 42.

The square root of 91946391 is about 9588.8680770986. The cubic root of 91946391 is about 451.3480416597.

The spelling of 91946391 in words is "ninety-one million, nine hundred forty-six thousand, three hundred ninety-one".