31343399 has 2 divisors, whose sum is σ = 31343400. Its totient is φ = 31343398.

The previous prime is 31343269. The next prime is 31343401. The reversal of 31343399 is 99334313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31343399 - 2²⁴ = 14566183 is a prime.

Together with 31343401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31348399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15671699 + 15671700.

It is an arithmetic number, because the mean of its divisors is an integer number (15671700).

Almost surely, 2^31343399 is an apocalyptic number.

31343399 is a deficient number, since it is larger than the sum of its proper divisors (1).

31343399 is an equidigital number, since it uses as much as digits as its factorization.

31343399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 35.

The square root of 31343399 is about 5598.5175716434. The cubic root of 31343399 is about 315.2937513420.

The spelling of 31343399 in words is "thirty-one million, three hundred forty-three thousand, three hundred ninety-nine".