91434721 has 8 divisors (see below), whose sum is σ = 110643840. Its totient is φ = 73762368.

The previous prime is 91434713. The next prime is 91434743. The reversal of 91434721 is 12743419.

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

It is a cyclic number.

It is not a de Polignac number, because 91434721 - 2³ = 91434713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91434701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 384061 + ... + 384298.

It is an arithmetic number, because the mean of its divisors is an integer number (13830480).

Almost surely, 2^91434721 is an apocalyptic number.

It is an amenable number.

91434721 is a deficient number, since it is larger than the sum of its proper divisors (19209119).

91434721 is a wasteful number, since it uses less digits than its factorization.

91434721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768383.

The product of its digits is 6048, while the sum is 31.

The square root of 91434721 is about 9562.1504380552. The cubic root of 91434721 is about 450.5092522828.

The spelling of 91434721 in words is "ninety-one million, four hundred thirty-four thousand, seven hundred twenty-one".