131455221 has 16 divisors (see below), whose sum is σ = 181862400. Its totient is φ = 84371760.

The previous prime is 131455217. The next prime is 131455223. The reversal of 131455221 is 122554131.

It is a happy number.

It is not a de Polignac number, because 131455221 - 2² = 131455217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131455191 and 131455200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131455223) 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, 14956 + ... + 22058.

It is an arithmetic number, because the mean of its divisors is an integer number (11366400).

Almost surely, 2^131455221 is an apocalyptic number.

It is an amenable number.

131455221 is a deficient number, since it is larger than the sum of its proper divisors (50407179).

131455221 is a wasteful number, since it uses less digits than its factorization.

131455221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7336.

The product of its digits is 1200, while the sum is 24.

The square root of 131455221 is about 11465.3923177535. The cubic root of 131455221 is about 508.4629114321.

The spelling of 131455221 in words is "one hundred thirty-one million, four hundred fifty-five thousand, two hundred twenty-one".