321143969 has 2 divisors, whose sum is σ = 321143970. Its totient is φ = 321143968.

The previous prime is 321143959. The next prime is 321143981. The reversal of 321143969 is 969341123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 314707600 + 6436369 = 17740^2 + 2537^2 .

It is a cyclic number.

It is not a de Polignac number, because 321143969 - 2¹² = 321139873 is a prime.

It is a super-2 number, since 2×321143969² = 206266897650145922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321143959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160571984 + 160571985.

It is an arithmetic number, because the mean of its divisors is an integer number (160571985).

Almost surely, 2^321143969 is an apocalyptic number.

It is an amenable number.

321143969 is a deficient number, since it is larger than the sum of its proper divisors (1).

321143969 is an equidigital number, since it uses as much as digits as its factorization.

321143969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 38.

The square root of 321143969 is about 17920.4901997685. The cubic root of 321143969 is about 684.8044757813.

The spelling of 321143969 in words is "three hundred twenty-one million, one hundred forty-three thousand, nine hundred sixty-nine".