31245749 has 2 divisors, whose sum is σ = 31245750. Its totient is φ = 31245748.

The previous prime is 31245719. The next prime is 31245757. The reversal of 31245749 is 94754213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31158724 + 87025 = 5582^2 + 295^2 .

It is an emirp because it is prime and its reverse (94754213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31245749 - 2²⁰ = 30197173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31245719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15622874 + 15622875.

It is an arithmetic number, because the mean of its divisors is an integer number (15622875).

Almost surely, 2^31245749 is an apocalyptic number.

It is an amenable number.

31245749 is a deficient number, since it is larger than the sum of its proper divisors (1).

31245749 is an equidigital number, since it uses as much as digits as its factorization.

31245749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 31245749 is about 5589.7897098191. The cubic root of 31245749 is about 314.9659793610.

The spelling of 31245749 in words is "thirty-one million, two hundred forty-five thousand, seven hundred forty-nine".