131368221 has 6 divisors (see below), whose sum is σ = 189754110. Its totient is φ = 87578808.

The previous prime is 131368207. The next prime is 131368229. The reversal of 131368221 is 122863131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 66243321 + 65124900 = 8139^2 + 8070^2 .

It is not a de Polignac number, because 131368221 - 2⁵ = 131368189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131368229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7298226 + ... + 7298243.

It is an arithmetic number, because the mean of its divisors is an integer number (31625685).

Almost surely, 2^131368221 is an apocalyptic number.

It is an amenable number.

131368221 is a deficient number, since it is larger than the sum of its proper divisors (58385889).

131368221 is a wasteful number, since it uses less digits than its factorization.

131368221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14596475 (or 14596472 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 131368221 is about 11461.5976635022. The cubic root of 131368221 is about 508.3507159752.

The spelling of 131368221 in words is "one hundred thirty-one million, three hundred sixty-eight thousand, two hundred twenty-one".