2361581 has 2 divisors, whose sum is σ = 2361582. Its totient is φ = 2361580.

The previous prime is 2361577. The next prime is 2361607. The reversal of 2361581 is 1851632.

It is an a-pointer prime, because the next prime (2361607) can be obtained adding 2361581 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2102500 + 259081 = 1450^2 + 509^2 .

It is a cyclic number.

It is not a de Polignac number, because 2361581 - 2² = 2361577 is a prime.

It is a super-2 number, since 2×2361581² = 11154129639122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2361581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2361781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1180790 + 1180791.

It is an arithmetic number, because the mean of its divisors is an integer number (1180791).

2^2361581 is an apocalyptic number.

It is an amenable number.

2361581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2361581 is an equidigital number, since it uses as much as digits as its factorization.

2361581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 2361581 is about 1536.7436350934. The cubic root of 2361581 is about 133.1683285237.

The spelling of 2361581 in words is "two million, three hundred sixty-one thousand, five hundred eighty-one".