2131223291 has 2 divisors, whose sum is σ = 2131223292. Its totient is φ = 2131223290.

The previous prime is 2131223261. The next prime is 2131223317. The reversal of 2131223291 is 1923221312.

It is an a-pointer prime, because the next prime (2131223317) can be obtained adding 2131223291 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2131223291 - 2²² = 2127028987 is a prime.

It is a super-2 number, since 2×2131223291² = 9084225432201741362, 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 2131223291.

It is not a weakly prime, because it can be changed into another prime (2131223201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065611645 + 1065611646.

It is an arithmetic number, because the mean of its divisors is an integer number (1065611646).

Almost surely, 2^2131223291 is an apocalyptic number.

2131223291 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131223291 is an equidigital number, since it uses as much as digits as its factorization.

2131223291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 2131223291 is about 46165.1740059539. The cubic root of 2131223291 is about 1286.8946179109.

The spelling of 2131223291 in words is "two billion, one hundred thirty-one million, two hundred twenty-three thousand, two hundred ninety-one".