961991707 has 2 divisors, whose sum is σ = 961991708. Its totient is φ = 961991706.

The previous prime is 961991689. The next prime is 961991753. The reversal of 961991707 is 707199169.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 961991707 - 2⁷ = 961991579 is a prime.

It is not a weakly prime, because it can be changed into another prime (961991207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480995853 + 480995854.

It is an arithmetic number, because the mean of its divisors is an integer number (480995854).

Almost surely, 2^961991707 is an apocalyptic number.

961991707 is a deficient number, since it is larger than the sum of its proper divisors (1).

961991707 is an equidigital number, since it uses as much as digits as its factorization.

961991707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 214326, while the sum is 49.

The square root of 961991707 is about 31015.9911497279. The cubic root of 961991707 is about 987.1665767897.

The spelling of 961991707 in words is "nine hundred sixty-one million, nine hundred ninety-one thousand, seven hundred seven".