431312381 has 2 divisors, whose sum is σ = 431312382. Its totient is φ = 431312380.

The previous prime is 431312363. The next prime is 431312383. The reversal of 431312381 is 183213134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413756281 + 17556100 = 20341^2 + 4190^2 .

It is a cyclic number.

It is not a de Polignac number, because 431312381 - 2¹⁰ = 431311357 is a prime.

It is a super-2 number, since 2×431312381² = 372060740007778322, which contains 22 as substring.

Together with 431312383, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 431312381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431312383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215656190 + 215656191.

It is an arithmetic number, because the mean of its divisors is an integer number (215656191).

Almost surely, 2^431312381 is an apocalyptic number.

It is an amenable number.

431312381 is a deficient number, since it is larger than the sum of its proper divisors (1).

431312381 is an equidigital number, since it uses as much as digits as its factorization.

431312381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 431312381 is about 20768.0615609642. The cubic root of 431312381 is about 755.5513309941.

The spelling of 431312381 in words is "four hundred thirty-one million, three hundred twelve thousand, three hundred eighty-one".