2990643281 has 16 divisors (see below), whose sum is σ = 3198845520. Its totient is φ = 2786150400.

The previous prime is 2990643251. The next prime is 2990643283. The reversal of 2990643281 is 1823460992.

It can be written as a sum of positive squares in 8 ways, for example, as 32262400 + 2958380881 = 5680^2 + 54391^2 .

It is not a de Polignac number, because 2990643281 - 2⁶ = 2990643217 is a prime.

It is a super-2 number, since 2×2990643281² = 17887894468380889922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2990643283) 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, 904331 + ... + 907631.

It is an arithmetic number, because the mean of its divisors is an integer number (199927845).

Almost surely, 2^2990643281 is an apocalyptic number.

It is an amenable number.

2990643281 is a deficient number, since it is larger than the sum of its proper divisors (208202239).

2990643281 is a wasteful number, since it uses less digits than its factorization.

2990643281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3844.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 2990643281 is about 54686.7742786133. The cubic root of 2990643281 is about 1440.7485949840.

The spelling of 2990643281 in words is "two billion, nine hundred ninety million, six hundred forty-three thousand, two hundred eighty-one".