2261423581 has 2 divisors, whose sum is σ = 2261423582. Its totient is φ = 2261423580.

The previous prime is 2261423579. The next prime is 2261423587. The reversal of 2261423581 is 1853241622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2260146681 + 1276900 = 47541^2 + 1130^2 .

It is a cyclic number.

It is not a de Polignac number, because 2261423581 - 2¹ = 2261423579 is a prime.

It is a super-2 number, since 2×2261423581² = 10228073225405727122, which contains 22 as substring.

Together with 2261423579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2261423587) 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 as a sum of consecutive naturals, namely, 1130711790 + 1130711791.

It is an arithmetic number, because the mean of its divisors is an integer number (1130711791).

Almost surely, 2^2261423581 is an apocalyptic number.

It is an amenable number.

2261423581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2261423581 is an equidigital number, since it uses as much as digits as its factorization.

2261423581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 34.

The square root of 2261423581 is about 47554.4275646338. The cubic root of 2261423581 is about 1312.5846028125.

The spelling of 2261423581 in words is "two billion, two hundred sixty-one million, four hundred twenty-three thousand, five hundred eighty-one".