1226842581 has 4 divisors (see below), whose sum is σ = 1635790112. Its totient is φ = 817895052.

The previous prime is 1226842571. The next prime is 1226842619. The reversal of 1226842581 is 1852486221.

It is a happy number.

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 1226842581 - 2¹⁵ = 1226809813 is a prime.

It is a super-2 number, since 2×1226842581² = 3010285437109483122, 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 (1226842501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204473761 + ... + 204473766.

It is an arithmetic number, because the mean of its divisors is an integer number (408947528).

Almost surely, 2^1226842581 is an apocalyptic number.

It is an amenable number.

1226842581 is a deficient number, since it is larger than the sum of its proper divisors (408947531).

1226842581 is an equidigital number, since it uses as much as digits as its factorization.

1226842581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408947530.

The product of its digits is 61440, while the sum is 39.

The square root of 1226842581 is about 35026.3126948870. The cubic root of 1226842581 is about 1070.5236849003.

The spelling of 1226842581 in words is "one billion, two hundred twenty-six million, eight hundred forty-two thousand, five hundred eighty-one".