959615991 has 12 divisors (see below), whose sum is σ = 1437449832. Its totient is φ = 639743832.

The previous prime is 959615971. The next prime is 959615999. The reversal of 959615991 is 199516959.

It is not a de Polignac number, because 959615991 - 2¹³ = 959607799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (959615999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1974276 + ... + 1974761.

It is an arithmetic number, because the mean of its divisors is an integer number (119787486).

Almost surely, 2^959615991 is an apocalyptic number.

959615991 is a deficient number, since it is larger than the sum of its proper divisors (477833841).

959615991 is an equidigital number, since it uses as much as digits as its factorization.

959615991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3949052 (or 3949040 counting only the distinct ones).

The product of its digits is 984150, while the sum is 54.

The square root of 959615991 is about 30977.6692312382. The cubic root of 959615991 is about 986.3532777966.

The spelling of 959615991 in words is "nine hundred fifty-nine million, six hundred fifteen thousand, nine hundred ninety-one".