873664691 has 2 divisors, whose sum is σ = 873664692. Its totient is φ = 873664690.

The previous prime is 873664679. The next prime is 873664699. The reversal of 873664691 is 196466378.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-873664691 is a prime.

It is not a weakly prime, because it can be changed into another prime (873664699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436832345 + 436832346.

It is an arithmetic number, because the mean of its divisors is an integer number (436832346).

Almost surely, 2^873664691 is an apocalyptic number.

873664691 is a deficient number, since it is larger than the sum of its proper divisors (1).

873664691 is an equidigital number, since it uses as much as digits as its factorization.

873664691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The square root of 873664691 is about 29557.8194561101. The cubic root of 873664691 is about 955.9788000148.

The spelling of 873664691 in words is "eight hundred seventy-three million, six hundred sixty-four thousand, six hundred ninety-one".