345431 has 2 divisors, whose sum is σ = 345432. Its totient is φ = 345430.

The previous prime is 345413. The next prime is 345451. The reversal of 345431 is 134543.

Together with previous prime (345413) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (345451) can be obtained adding 345431 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345431 is a prime.

It is a super-2 number, since 2×345431² = 238645151522, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 345431.

It is not a weakly prime, because it can be changed into another prime (345451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172715 + 172716.

It is an arithmetic number, because the mean of its divisors is an integer number (172716).

2³⁴⁵⁴³¹ is an apocalyptic number.

345431 is a deficient number, since it is larger than the sum of its proper divisors (1).

345431 is an equidigital number, since it uses as much as digits as its factorization.

345431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 20.

The square root of 345431 is about 587.7337832727. The cubic root of 345431 is about 70.1649849864.

Adding to 345431 its reverse (134543), we get a palindrome (479974).

The spelling of 345431 in words is "three hundred forty-five thousand, four hundred thirty-one".