991742707 has 2 divisors, whose sum is σ = 991742708. Its totient is φ = 991742706.

The previous prime is 991742683. The next prime is 991742729. The reversal of 991742707 is 707247199.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991742707 is a prime.

It is not a weakly prime, because it can be changed into another prime (991742737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495871353 + 495871354.

It is an arithmetic number, because the mean of its divisors is an integer number (495871354).

Almost surely, 2^991742707 is an apocalyptic number.

991742707 is a deficient number, since it is larger than the sum of its proper divisors (1).

991742707 is an equidigital number, since it uses as much as digits as its factorization.

991742707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 222264, while the sum is 46.

The square root of 991742707 is about 31491.9467007043. The cubic root of 991742707 is about 997.2399581776.

The spelling of 991742707 in words is "nine hundred ninety-one million, seven hundred forty-two thousand, seven hundred seven".