131621215 has 16 divisors (see below), whose sum is σ = 172538496. Its totient is φ = 95594400.

The previous prime is 131621213. The next prime is 131621221. The reversal of 131621215 is 512126131.

It is a happy number.

It is not a de Polignac number, because 131621215 - 2¹ = 131621213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131621213) 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, 60700 + ... + 62830.

It is an arithmetic number, because the mean of its divisors is an integer number (10783656).

Almost surely, 2^131621215 is an apocalyptic number.

131621215 is a deficient number, since it is larger than the sum of its proper divisors (40917281).

131621215 is a wasteful number, since it uses less digits than its factorization.

131621215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3270.

The product of its digits is 360, while the sum is 22.

The square root of 131621215 is about 11472.6289489376. The cubic root of 131621215 is about 508.6768405325.

Adding to 131621215 its reverse (512126131), we get a palindrome (643747346).

The spelling of 131621215 in words is "one hundred thirty-one million, six hundred twenty-one thousand, two hundred fifteen".