891254665 has 32 divisors (see below), whose sum is σ = 1296725760. Its totient is φ = 574070784.

The previous prime is 891254659. The next prime is 891254671. The reversal of 891254665 is 566452198.

It is an interprime number because it is at equal distance from previous prime (891254659) and next prime (891254671).

It is not a de Polignac number, because 891254665 - 2³ = 891254657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 390969 + ... + 393241.

It is an arithmetic number, because the mean of its divisors is an integer number (40522680).

Almost surely, 2^891254665 is an apocalyptic number.

891254665 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

891254665 is a deficient number, since it is larger than the sum of its proper divisors (405471095).

891254665 is a wasteful number, since it uses less digits than its factorization.

891254665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2961.

The product of its digits is 518400, while the sum is 46.

The square root of 891254665 is about 29853.8886076839. Note that the first 3 decimals coincide. The cubic root of 891254665 is about 962.3519677888.

The spelling of 891254665 in words is "eight hundred ninety-one million, two hundred fifty-four thousand, six hundred sixty-five".