131553221 has 2 divisors, whose sum is σ = 131553222. Its totient is φ = 131553220.

The previous prime is 131553161. The next prime is 131553229. The reversal of 131553221 is 122355131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124322500 + 7230721 = 11150^2 + 2689^2 .

It is a cyclic number.

It is not a de Polignac number, because 131553221 - 2¹⁸ = 131291077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131553229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65776610 + 65776611.

It is an arithmetic number, because the mean of its divisors is an integer number (65776611).

Almost surely, 2^131553221 is an apocalyptic number.

It is an amenable number.

131553221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131553221 is an equidigital number, since it uses as much as digits as its factorization.

131553221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 23.

The square root of 131553221 is about 11469.6652523079. The cubic root of 131553221 is about 508.5892332509.

The spelling of 131553221 in words is "one hundred thirty-one million, five hundred fifty-three thousand, two hundred twenty-one".