91447379 has 8 divisors (see below), whose sum is σ = 95530752. Its totient is φ = 87373000.

The previous prime is 91447337. The next prime is 91447393. The reversal of 91447379 is 97374419.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91447379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91447079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26504 + ... + 29754.

It is an arithmetic number, because the mean of its divisors is an integer number (11941344).

Almost surely, 2^91447379 is an apocalyptic number.

91447379 is a deficient number, since it is larger than the sum of its proper divisors (4083373).

91447379 is a wasteful number, since it uses less digits than its factorization.

91447379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4497.

The product of its digits is 190512, while the sum is 44.

The square root of 91447379 is about 9562.8122955541. The cubic root of 91447379 is about 450.5300404579.

The spelling of 91447379 in words is "ninety-one million, four hundred forty-seven thousand, three hundred seventy-nine".