494791691 has 2 divisors, whose sum is σ = 494791692. Its totient is φ = 494791690.

The previous prime is 494791643. The next prime is 494791721. The reversal of 494791691 is 196197494.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-494791691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (494791291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247395845 + 247395846.

It is an arithmetic number, because the mean of its divisors is an integer number (247395846).

Almost surely, 2^494791691 is an apocalyptic number.

494791691 is a deficient number, since it is larger than the sum of its proper divisors (1).

494791691 is an equidigital number, since it uses as much as digits as its factorization.

494791691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The square root of 494791691 is about 22243.9135720313. The cubic root of 494791691 is about 790.9350094682.

The spelling of 494791691 in words is "four hundred ninety-four million, seven hundred ninety-one thousand, six hundred ninety-one".