891261659 has 4 divisors (see below), whose sum is σ = 892184304. Its totient is φ = 890339016.

The previous prime is 891261643. The next prime is 891261689. The reversal of 891261659 is 956162198.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 891261659 - 2⁴ = 891261643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891261689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459872 + ... + 461805.

It is an arithmetic number, because the mean of its divisors is an integer number (223046076).

Almost surely, 2^891261659 is an apocalyptic number.

891261659 is a deficient number, since it is larger than the sum of its proper divisors (922645).

891261659 is an equidigital number, since it uses as much as digits as its factorization.

891261659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922644.

The product of its digits is 233280, while the sum is 47.

The square root of 891261659 is about 29854.0057446233. The cubic root of 891261659 is about 962.3544850910.

The spelling of 891261659 in words is "eight hundred ninety-one million, two hundred sixty-one thousand, six hundred fifty-nine".