12423581 has 2 divisors, whose sum is σ = 12423582. Its totient is φ = 12423580.

The previous prime is 12423577. The next prime is 12423613. The reversal of 12423581 is 18532421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10048900 + 2374681 = 3170^2 + 1541^2 .

It is a cyclic number.

It is not a de Polignac number, because 12423581 - 2² = 12423577 is a prime.

It is a super-2 number, since 2×12423581² = 308690729727122, 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 12423581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12423781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6211790 + 6211791.

It is an arithmetic number, because the mean of its divisors is an integer number (6211791).

Almost surely, 2^12423581 is an apocalyptic number.

It is an amenable number.

12423581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12423581 is an equidigital number, since it uses as much as digits as its factorization.

12423581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 26.

The square root of 12423581 is about 3524.7100589978. The cubic root of 12423581 is about 231.6055338468.

The spelling of 12423581 in words is "twelve million, four hundred twenty-three thousand, five hundred eighty-one".