126412581 has 4 divisors (see below), whose sum is σ = 168550112. Its totient is φ = 84275052.

The previous prime is 126412549. The next prime is 126412607. The reversal of 126412581 is 185214621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 126412581 - 2⁵ = 126412549 is a prime.

It is a super-2 number, since 2×126412581² = 31960281270163122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126412501) 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, 21068761 + ... + 21068766.

It is an arithmetic number, because the mean of its divisors is an integer number (42137528).

Almost surely, 2^126412581 is an apocalyptic number.

It is an amenable number.

126412581 is a deficient number, since it is larger than the sum of its proper divisors (42137531).

126412581 is an equidigital number, since it uses as much as digits as its factorization.

126412581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42137530.

The product of its digits is 3840, while the sum is 30.

The square root of 126412581 is about 11243.3349589879. The cubic root of 126412581 is about 501.8763908395.

The spelling of 126412581 in words is "one hundred twenty-six million, four hundred twelve thousand, five hundred eighty-one".