131071221 has 6 divisors (see below), whose sum is σ = 189325110. Its totient is φ = 87380808.

The previous prime is 131071217. The next prime is 131071223. The reversal of 131071221 is 122170131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 118919025 + 12152196 = 10905^2 + 3486^2 .

It is not a de Polignac number, because 131071221 - 2² = 131071217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131071194 and 131071203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131071223) 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, 7281726 + ... + 7281743.

It is an arithmetic number, because the mean of its divisors is an integer number (31554185).

Almost surely, 2^131071221 is an apocalyptic number.

It is an amenable number.

131071221 is a deficient number, since it is larger than the sum of its proper divisors (58253889).

131071221 is a wasteful number, since it uses less digits than its factorization.

131071221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14563475 (or 14563472 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 131071221 is about 11448.6340233235. The cubic root of 131071221 is about 507.9673302920.

The spelling of 131071221 in words is "one hundred thirty-one million, seventy-one thousand, two hundred twenty-one".