31243493 has 2 divisors, whose sum is σ = 31243494. Its totient is φ = 31243492.

The previous prime is 31243463. The next prime is 31243519. The reversal of 31243493 is 39434213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30991489 + 252004 = 5567^2 + 502^2 .

It is a cyclic number.

It is not a de Polignac number, because 31243493 - 2²² = 27049189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31243423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15621746 + 15621747.

It is an arithmetic number, because the mean of its divisors is an integer number (15621747).

Almost surely, 2^31243493 is an apocalyptic number.

It is an amenable number.

31243493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31243493 is an equidigital number, since it uses as much as digits as its factorization.

31243493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 29.

The square root of 31243493 is about 5589.5879096763. The cubic root of 31243493 is about 314.9583988061.

The spelling of 31243493 in words is "thirty-one million, two hundred forty-three thousand, four hundred ninety-three".