131224621 has 16 divisors (see below), whose sum is σ = 151963200. Its totient is φ = 112994640.

The previous prime is 131224601. The next prime is 131224627. The reversal of 131224621 is 126422131.

It is not a de Polignac number, because 131224621 - 2⁵ = 131224589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131224592 and 131224601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131224627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22695 + ... + 27883.

It is an arithmetic number, because the mean of its divisors is an integer number (9497700).

Almost surely, 2^131224621 is an apocalyptic number.

131224621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131224621 is a deficient number, since it is larger than the sum of its proper divisors (20738579).

131224621 is an equidigital number, since it uses as much as digits as its factorization.

131224621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5241 (or 5219 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 131224621 is about 11455.3315534733. The cubic root of 131224621 is about 508.1654205840.

Adding to 131224621 its reverse (126422131), we get a palindrome (257646752).

The spelling of 131224621 in words is "one hundred thirty-one million, two hundred twenty-four thousand, six hundred twenty-one".