321240131 has 2 divisors, whose sum is σ = 321240132. Its totient is φ = 321240130.

The previous prime is 321240119. The next prime is 321240137. The reversal of 321240131 is 131042123.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321240131 is a prime.

It is a super-2 number, since 2×321240131² = 206390443529794322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321240137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160620065 + 160620066.

It is an arithmetic number, because the mean of its divisors is an integer number (160620066).

Almost surely, 2^321240131 is an apocalyptic number.

321240131 is a deficient number, since it is larger than the sum of its proper divisors (1).

321240131 is an equidigital number, since it uses as much as digits as its factorization.

321240131 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 17.

The square root of 321240131 is about 17923.1730170749. The cubic root of 321240131 is about 684.8728206179.

Adding to 321240131 its reverse (131042123), we get a palindrome (452282254).

The spelling of 321240131 in words is "three hundred twenty-one million, two hundred forty thousand, one hundred thirty-one".