131386921 has 2 divisors, whose sum is σ = 131386922. Its totient is φ = 131386920.

The previous prime is 131386901. The next prime is 131386951. The reversal of 131386921 is 129683131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131354521 + 32400 = 11461^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 131386921 - 2¹¹ = 131384873 is a prime.

It is not a weakly prime, because it can be changed into another prime (131386901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65693460 + 65693461.

It is an arithmetic number, because the mean of its divisors is an integer number (65693461).

Almost surely, 2^131386921 is an apocalyptic number.

It is an amenable number.

131386921 is a deficient number, since it is larger than the sum of its proper divisors (1).

131386921 is an equidigital number, since it uses as much as digits as its factorization.

131386921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 131386921 is about 11462.4134020720. The cubic root of 131386921 is about 508.3748357288.

The spelling of 131386921 in words is "one hundred thirty-one million, three hundred eighty-six thousand, nine hundred twenty-one".