990643359131 has 8 divisors (see below), whose sum is σ = 1051235400960. Its totient is φ = 931511366632.

The previous prime is 990643359119. The next prime is 990643359161. The reversal of 990643359131 is 131953346099.

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

It is a de Polignac number, because none of the positive numbers 2^k-990643359131 is a prime.

It is a super-2 number, since 2×990643359131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990643359161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365010935 + ... + 365013648.

It is an arithmetic number, because the mean of its divisors is an integer number (131404425120).

Almost surely, 2^990643359131 is an apocalyptic number.

990643359131 is a deficient number, since it is larger than the sum of its proper divisors (60592041829).

990643359131 is a wasteful number, since it uses less digits than its factorization.

990643359131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730024665.

The product of its (nonzero) digits is 2361960, while the sum is 53.

The spelling of 990643359131 in words is "nine hundred ninety billion, six hundred forty-three million, three hundred fifty-nine thousand, one hundred thirty-one".