991607151874 has 8 divisors (see below), whose sum is σ = 1494961036668. Its totient is φ = 493286806320.

The previous prime is 991607151809. The next prime is 991607151901. The reversal of 991607151874 is 478151706199.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 851757330649 + 139849821225 = 922907^2 + 373965^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×991607151874² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1258384317 + ... + 1258385104.

Almost surely, 2^991607151874 is an apocalyptic number.

991607151874 is a deficient number, since it is larger than the sum of its proper divisors (503353884794).

991607151874 is a wasteful number, since it uses less digits than its factorization.

991607151874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2516769620.

The product of its (nonzero) digits is 3810240, while the sum is 58.

The spelling of 991607151874 in words is "nine hundred ninety-one billion, six hundred seven million, one hundred fifty-one thousand, eight hundred seventy-four".