91220351 has 8 divisors (see below), whose sum is σ = 96966720. Its totient is φ = 85516288.

The previous prime is 91220347. The next prime is 91220357. The reversal of 91220351 is 15302219.

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 91220351 - 2² = 91220347 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91220357) 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, 6071 + ... + 14808.

It is an arithmetic number, because the mean of its divisors is an integer number (12120840).

Almost surely, 2^91220351 is an apocalyptic number.

91220351 is a deficient number, since it is larger than the sum of its proper divisors (5746369).

91220351 is a wasteful number, since it uses less digits than its factorization.

91220351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21153.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 91220351 is about 9550.9345616018. The cubic root of 91220351 is about 450.1569016653.

The spelling of 91220351 in words is "ninety-one million, two hundred twenty thousand, three hundred fifty-one".