840760691 has 2 divisors, whose sum is σ = 840760692. Its totient is φ = 840760690.

The previous prime is 840760681. The next prime is 840760693. The reversal of 840760691 is 196067048.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840760691 is a prime.

Together with 840760693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (840760693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420380345 + 420380346.

It is an arithmetic number, because the mean of its divisors is an integer number (420380346).

Almost surely, 2^840760691 is an apocalyptic number.

840760691 is a deficient number, since it is larger than the sum of its proper divisors (1).

840760691 is an equidigital number, since it uses as much as digits as its factorization.

840760691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 840760691 is about 28995.8736891993. The cubic root of 840760691 is about 943.8235281747.

The spelling of 840760691 in words is "eight hundred forty million, seven hundred sixty thousand, six hundred ninety-one".