131621211 has 6 divisors (see below), whose sum is σ = 190119540. Its totient is φ = 87747468.

The previous prime is 131621141. The next prime is 131621213. The reversal of 131621211 is 112126131.

131621211 is a `hidden beast` number, since 1 + 31 + 621 + 2 + 11 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-131621211 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 7312281 + ... + 7312298.

It is an arithmetic number, because the mean of its divisors is an integer number (31686590).

Almost surely, 2^131621211 is an apocalyptic number.

131621211 is a deficient number, since it is larger than the sum of its proper divisors (58498329).

131621211 is a wasteful number, since it uses less digits than its factorization.

131621211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14624585 (or 14624582 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 131621211 is about 11472.6287746096. The cubic root of 131621211 is about 508.6768353796.

Adding to 131621211 its reverse (112126131), we get a palindrome (243747342).

The spelling of 131621211 in words is "one hundred thirty-one million, six hundred twenty-one thousand, two hundred eleven".