990343081 has 16 divisors (see below), whose sum is σ = 1258206208. Its totient is φ = 758289600.

The previous prime is 990343037. The next prime is 990343091. The reversal of 990343081 is 180343099.

It is a cyclic number.

It is not a de Polignac number, because 990343081 - 2¹⁷ = 990212009 is a prime.

It is a super-2 number, since 2×990343081² = 1961558836169145122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 990343081.

It is not an unprimeable number, because it can be changed into a prime (990343021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172710 + ... + 178351.

It is an arithmetic number, because the mean of its divisors is an integer number (78637888).

Almost surely, 2^990343081 is an apocalyptic number.

990343081 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

990343081 is a deficient number, since it is larger than the sum of its proper divisors (267863127).

990343081 is a wasteful number, since it uses less digits than its factorization.

990343081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351112.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 990343081 is about 31469.7168878273. The cubic root of 990343081 is about 996.7706092619.

The spelling of 990343081 in words is "nine hundred ninety million, three hundred forty-three thousand, eighty-one".