31742393 has 2 divisors, whose sum is σ = 31742394. Its totient is φ = 31742392.

The previous prime is 31742363. The next prime is 31742401. The reversal of 31742393 is 39324713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25725184 + 6017209 = 5072^2 + 2453^2 .

It is an emirp because it is prime and its reverse (39324713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31742393 - 2⁶ = 31742329 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31742353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15871196 + 15871197.

It is an arithmetic number, because the mean of its divisors is an integer number (15871197).

Almost surely, 2^31742393 is an apocalyptic number.

It is an amenable number.

31742393 is a deficient number, since it is larger than the sum of its proper divisors (1).

31742393 is an equidigital number, since it uses as much as digits as its factorization.

31742393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 32.

The square root of 31742393 is about 5634.0387822591. The cubic root of 31742393 is about 316.6259856636.

The spelling of 31742393 in words is "thirty-one million, seven hundred forty-two thousand, three hundred ninety-three".