990502631 has 4 divisors (see below), whose sum is σ = 994828200. Its totient is φ = 986177064.

The previous prime is 990502577. The next prime is 990502633. The reversal of 990502631 is 136205099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136205099 = 59 ⋅2308561.

It is a cyclic number.

It is not a de Polignac number, because 990502631 - 2¹⁰ = 990501607 is a prime.

It is a super-2 number, since 2×990502631² = 1962190924035844322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 990502591 and 990502600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990502633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2162441 + ... + 2162898.

It is an arithmetic number, because the mean of its divisors is an integer number (248707050).

Almost surely, 2^990502631 is an apocalyptic number.

990502631 is a deficient number, since it is larger than the sum of its proper divisors (4325569).

990502631 is a wasteful number, since it uses less digits than its factorization.

990502631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4325568.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 990502631 is about 31472.2517624653. The cubic root of 990502631 is about 996.8241348915.

The spelling of 990502631 in words is "nine hundred ninety million, five hundred two thousand, six hundred thirty-one".