891314609 has 2 divisors, whose sum is σ = 891314610. Its totient is φ = 891314608.

The previous prime is 891314581. The next prime is 891314629. The reversal of 891314609 is 906413198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 591851584 + 299463025 = 24328^2 + 17305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891314609 is a prime.

It is a Chen prime.

It is equal to p_45588137 and since 891314609 and 45588137 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (891314629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445657304 + 445657305.

It is an arithmetic number, because the mean of its divisors is an integer number (445657305).

Almost surely, 2^891314609 is an apocalyptic number.

It is an amenable number.

891314609 is a deficient number, since it is larger than the sum of its proper divisors (1).

891314609 is an equidigital number, since it uses as much as digits as its factorization.

891314609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 891314609 is about 29854.8925471186. The cubic root of 891314609 is about 962.3735425924.

The spelling of 891314609 in words is "eight hundred ninety-one million, three hundred fourteen thousand, six hundred nine".