131226619 has 4 divisors (see below), whose sum is σ = 132453144. Its totient is φ = 130000096.

The previous prime is 131226617. The next prime is 131226643. The reversal of 131226619 is 916622131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131226619 - 2¹ = 131226617 is a prime.

It is a super-2 number, since 2×131226619² = 34440851068342322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131226611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613102 + ... + 613315.

It is an arithmetic number, because the mean of its divisors is an integer number (33113286).

Almost surely, 2^131226619 is an apocalyptic number.

131226619 is a deficient number, since it is larger than the sum of its proper divisors (1226525).

131226619 is a wasteful number, since it uses less digits than its factorization.

131226619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226524.

The product of its digits is 3888, while the sum is 31.

The square root of 131226619 is about 11455.4187614421. The cubic root of 131226619 is about 508.1679996462.

The spelling of 131226619 in words is "one hundred thirty-one million, two hundred twenty-six thousand, six hundred nineteen".