891264217 has 8 divisors (see below), whose sum is σ = 952176800. Its totient is φ = 831752064.

The previous prime is 891264181. The next prime is 891264223. The reversal of 891264217 is 712462198.

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 891264217 - 2²⁷ = 757046489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 891264217.

It is not an unprimeable number, because it can be changed into a prime (891264317) 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, 348792 + ... + 351337.

It is an arithmetic number, because the mean of its divisors is an integer number (119022100).

Almost surely, 2^891264217 is an apocalyptic number.

It is an amenable number.

891264217 is a deficient number, since it is larger than the sum of its proper divisors (60912583).

891264217 is a wasteful number, since it uses less digits than its factorization.

891264217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700215.

The product of its digits is 48384, while the sum is 40.

The square root of 891264217 is about 29854.0485864145. The cubic root of 891264217 is about 962.3554057710.

The spelling of 891264217 in words is "eight hundred ninety-one million, two hundred sixty-four thousand, two hundred seventeen".