31345357 has 2 divisors, whose sum is σ = 31345358. Its totient is φ = 31345356.

The previous prime is 31345339. The next prime is 31345373. The reversal of 31345357 is 75354313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19193161 + 12152196 = 4381^2 + 3486^2 .

It is an emirp because it is prime and its reverse (75354313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31345357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31345057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15672678 + 15672679.

It is an arithmetic number, because the mean of its divisors is an integer number (15672679).

Almost surely, 2^31345357 is an apocalyptic number.

It is an amenable number.

31345357 is a deficient number, since it is larger than the sum of its proper divisors (1).

31345357 is an equidigital number, since it uses as much as digits as its factorization.

31345357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900, while the sum is 31.

The square root of 31345357 is about 5598.6924366320. The cubic root of 31345357 is about 315.3003165980.

The spelling of 31345357 in words is "thirty-one million, three hundred forty-five thousand, three hundred fifty-seven".