891170641 has 8 divisors (see below), whose sum is σ = 927796904. Its totient is φ = 855204480.

The previous prime is 891170597. The next prime is 891170647. The reversal of 891170641 is 146071198.

It can be written as a sum of positive squares in 4 ways, for example, as 566630416 + 324540225 = 23804^2 + 18015^2 .

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 891170641 - 2⁷ = 891170513 is a prime.

It is a super-2 number, since 2×891170641² = 1588370222760701762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a deceptive number, since it divides R_891170640.

It is a self number, because there is not a number n which added to its sum of digits gives 891170641.

It is not an unprimeable number, because it can be changed into a prime (891170647) 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, 162270 + ... + 167671.

It is an arithmetic number, because the mean of its divisors is an integer number (115974613).

Almost surely, 2^891170641 is an apocalyptic number.

It is an amenable number.

891170641 is a deficient number, since it is larger than the sum of its proper divisors (36626263).

891170641 is a wasteful number, since it uses less digits than its factorization.

891170641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330051.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 891170641 is about 29852.4813206541. The cubic root of 891170641 is about 962.3217245799.

The spelling of 891170641 in words is "eight hundred ninety-one million, one hundred seventy thousand, six hundred forty-one".