991742683 has 2 divisors, whose sum is σ = 991742684. Its totient is φ = 991742682.

The previous prime is 991742671. The next prime is 991742707. The reversal of 991742683 is 386247199.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991742683 is a prime.

It is not a weakly prime, because it can be changed into another prime (991742383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495871341 + 495871342.

It is an arithmetic number, because the mean of its divisors is an integer number (495871342).

Almost surely, 2^991742683 is an apocalyptic number.

991742683 is a deficient number, since it is larger than the sum of its proper divisors (1).

991742683 is an equidigital number, since it uses as much as digits as its factorization.

991742683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The square root of 991742683 is about 31491.9463196545. The cubic root of 991742683 is about 997.2399501333.

The spelling of 991742683 in words is "nine hundred ninety-one million, seven hundred forty-two thousand, six hundred eighty-three".