891859513 has 2 divisors, whose sum is σ = 891859514. Its totient is φ = 891859512.

The previous prime is 891859483. The next prime is 891859537. The reversal of 891859513 is 315958198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 728352144 + 163507369 = 26988^2 + 12787^2 .

It is a cyclic number.

It is not a de Polignac number, because 891859513 - 2⁵ = 891859481 is a prime.

It is not a weakly prime, because it can be changed into another prime (891859543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445929756 + 445929757.

It is an arithmetic number, because the mean of its divisors is an integer number (445929757).

Almost surely, 2^891859513 is an apocalyptic number.

It is an amenable number.

891859513 is a deficient number, since it is larger than the sum of its proper divisors (1).

891859513 is an equidigital number, since it uses as much as digits as its factorization.

891859513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 49.

The square root of 891859513 is about 29864.0170271851. The cubic root of 891859513 is about 962.5696179025.

The spelling of 891859513 in words is "eight hundred ninety-one million, eight hundred fifty-nine thousand, five hundred thirteen".