321131099 has 2 divisors, whose sum is σ = 321131100. Its totient is φ = 321131098.

The previous prime is 321131089. The next prime is 321131117. The reversal of 321131099 is 990131123.

It is a weak prime.

It is an emirp because it is prime and its reverse (990131123) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321131099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321131059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160565549 + 160565550.

It is an arithmetic number, because the mean of its divisors is an integer number (160565550).

Almost surely, 2^321131099 is an apocalyptic number.

321131099 is a deficient number, since it is larger than the sum of its proper divisors (1).

321131099 is an equidigital number, since it uses as much as digits as its factorization.

321131099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 321131099 is about 17920.1311100114. The cubic root of 321131099 is about 684.7953277021.

The spelling of 321131099 in words is "three hundred twenty-one million, one hundred thirty-one thousand, ninety-nine".