990566031 has 32 divisors (see below), whose sum is σ = 1660151808. Its totient is φ = 511372800.

The previous prime is 990566009. The next prime is 990566039. The reversal of 990566031 is 130665099.

It is not a de Polignac number, because 990566031 - 2⁵ = 990565999 is a prime.

It is a super-2 number, since 2×990566031² = 1962442123542185922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990566039) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 25770 + ... + 51431.

It is an arithmetic number, because the mean of its divisors is an integer number (51879744).

Almost surely, 2^990566031 is an apocalyptic number.

990566031 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

990566031 is a deficient number, since it is larger than the sum of its proper divisors (669585777).

990566031 is a wasteful number, since it uses less digits than its factorization.

990566031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77271.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 990566031 is about 31473.2589828254. The cubic root of 990566031 is about 996.8454026465.

The spelling of 990566031 in words is "nine hundred ninety million, five hundred sixty-six thousand, thirty-one".