91774921 has 8 divisors (see below), whose sum is σ = 110406080. Its totient is φ = 74523888.

The previous prime is 91774909. The next prime is 91774951. The reversal of 91774921 is 12947719.

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 91774921 - 2¹¹ = 91772873 is a prime.

It is a super-2 number, since 2×91774921² = 16845272249112482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91774951) 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, 344886 + ... + 345151.

It is an arithmetic number, because the mean of its divisors is an integer number (13800760).

Almost surely, 2^91774921 is an apocalyptic number.

It is an amenable number.

91774921 is a deficient number, since it is larger than the sum of its proper divisors (18631159).

91774921 is a wasteful number, since it uses less digits than its factorization.

91774921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690063.

The product of its digits is 31752, while the sum is 40.

The square root of 91774921 is about 9579.9228076222. The cubic root of 91774921 is about 451.0672954286.

The spelling of 91774921 in words is "ninety-one million, seven hundred seventy-four thousand, nine hundred twenty-one".