31431343 has 2 divisors, whose sum is σ = 31431344. Its totient is φ = 31431342.

The previous prime is 31431319. The next prime is 31431373. The reversal of 31431343 is 34313413.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31431343 - 2⁵ = 31431311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31431373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15715671 + 15715672.

It is an arithmetic number, because the mean of its divisors is an integer number (15715672).

Almost surely, 2^31431343 is an apocalyptic number.

31431343 is a deficient number, since it is larger than the sum of its proper divisors (1).

31431343 is an equidigital number, since it uses as much as digits as its factorization.

31431343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 22.

The square root of 31431343 is about 5606.3662919934. The cubic root of 31431343 is about 315.5883620250.

Adding to 31431343 its reverse (34313413), we get a palindrome (65744756).

The spelling of 31431343 in words is "thirty-one million, four hundred thirty-one thousand, three hundred forty-three".