131945321 has 2 divisors, whose sum is σ = 131945322. Its totient is φ = 131945320.

The previous prime is 131945287. The next prime is 131945323. The reversal of 131945321 is 123549131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82101721 + 49843600 = 9061^2 + 7060^2 .

It is an emirp because it is prime and its reverse (123549131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131945321 - 2²² = 127751017 is a prime.

It is a super-3 number, since 3×131945321³ (a number of 25 digits) contains 333 as substring.

Together with 131945323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131945323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65972660 + 65972661.

It is an arithmetic number, because the mean of its divisors is an integer number (65972661).

Almost surely, 2^131945321 is an apocalyptic number.

It is an amenable number.

131945321 is a deficient number, since it is larger than the sum of its proper divisors (1).

131945321 is an equidigital number, since it uses as much as digits as its factorization.

131945321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 29.

The square root of 131945321 is about 11486.7454485594. The cubic root of 131945321 is about 509.0940227189.

The spelling of 131945321 in words is "one hundred thirty-one million, nine hundred forty-five thousand, three hundred twenty-one".