991288130024 has 16 divisors (see below), whose sum is σ = 1967998493700. Its totient is φ = 466488531712.

The previous prime is 991288130009. The next prime is 991288130039. The reversal of 991288130024 is 420031882199.

It is an interprime number because it is at equal distance from previous prime (991288130009) and next prime (991288130039).

It can be written as a sum of positive squares in 2 ways, for example, as 917783160100 + 73504969924 = 958010^2 + 271118^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3644441519 + ... + 3644441790.

Almost surely, 2^991288130024 is an apocalyptic number.

It is an amenable number.

991288130024 is a deficient number, since it is larger than the sum of its proper divisors (976710363676).

991288130024 is a wasteful number, since it uses less digits than its factorization.

991288130024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7288883332 (or 7288883328 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 991288130024 in words is "nine hundred ninety-one billion, two hundred eighty-eight million, one hundred thirty thousand, twenty-four".