891795691 has 2 divisors, whose sum is σ = 891795692. Its totient is φ = 891795690.

The previous prime is 891795659. The next prime is 891795739. The reversal of 891795691 is 196597198.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 891795691 - 2⁵ = 891795659 is a prime.

It is not a weakly prime, because it can be changed into another prime (891795601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445897845 + 445897846.

It is an arithmetic number, because the mean of its divisors is an integer number (445897846).

Almost surely, 2^891795691 is an apocalyptic number.

891795691 is a deficient number, since it is larger than the sum of its proper divisors (1).

891795691 is an equidigital number, since it uses as much as digits as its factorization.

891795691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 55.

The square root of 891795691 is about 29862.9484646108. The cubic root of 891795691 is about 962.5466566690.

The spelling of 891795691 in words is "eight hundred ninety-one million, seven hundred ninety-five thousand, six hundred ninety-one".