2290131991 has 4 divisors (see below), whose sum is σ = 2617293712. Its totient is φ = 1962970272.

The previous prime is 2290131989. The next prime is 2290132049. The reversal of 2290131991 is 1991310922.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2290131991 - 2¹ = 2290131989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2290131991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2290131901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163580850 + ... + 163580863.

It is an arithmetic number, because the mean of its divisors is an integer number (654323428).

Almost surely, 2^2290131991 is an apocalyptic number.

2290131991 is a deficient number, since it is larger than the sum of its proper divisors (327161721).

2290131991 is an equidigital number, since it uses as much as digits as its factorization.

2290131991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327161720.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 2290131991 is about 47855.3235387663. The cubic root of 2290131991 is about 1318.1156137284.

The spelling of 2290131991 in words is "two billion, two hundred ninety million, one hundred thirty-one thousand, nine hundred ninety-one".