131640121 has 2 divisors, whose sum is σ = 131640122. Its totient is φ = 131640120.

The previous prime is 131640101. The next prime is 131640127. The reversal of 131640121 is 121046131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125686521 + 5953600 = 11211^2 + 2440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131640121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131640127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65820060 + 65820061.

It is an arithmetic number, because the mean of its divisors is an integer number (65820061).

Almost surely, 2^131640121 is an apocalyptic number.

It is an amenable number.

131640121 is a deficient number, since it is larger than the sum of its proper divisors (1).

131640121 is an equidigital number, since it uses as much as digits as its factorization.

131640121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 131640121 is about 11473.4528804541. The cubic root of 131640121 is about 508.7011947217.

Adding to 131640121 its reverse (121046131), we get a palindrome (252686252).

The spelling of 131640121 in words is "one hundred thirty-one million, six hundred forty thousand, one hundred twenty-one".