321431269 has 2 divisors, whose sum is σ = 321431270. Its totient is φ = 321431268.

The previous prime is 321431263. The next prime is 321431323. The reversal of 321431269 is 962134123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 293711044 + 27720225 = 17138^2 + 5265^2 .

It is a cyclic number.

It is not a de Polignac number, because 321431269 - 2⁵ = 321431237 is a prime.

It is a super-2 number, since 2×321431269² = 206636121381900722, which contains 22 as substring.

It is equal to p_17348305 and since 321431269 and 17348305 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321431269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321431263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160715634 + 160715635.

It is an arithmetic number, because the mean of its divisors is an integer number (160715635).

Almost surely, 2^321431269 is an apocalyptic number.

It is an amenable number.

321431269 is a deficient number, since it is larger than the sum of its proper divisors (1).

321431269 is an equidigital number, since it uses as much as digits as its factorization.

321431269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

The square root of 321431269 is about 17928.5043715308. The cubic root of 321431269 is about 685.0086268827.

The spelling of 321431269 in words is "three hundred twenty-one million, four hundred thirty-one thousand, two hundred sixty-nine".