31029749 has 2 divisors, whose sum is σ = 31029750. Its totient is φ = 31029748.

The previous prime is 31029731. The next prime is 31029763. The reversal of 31029749 is 94792013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22515025 + 8514724 = 4745^2 + 2918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31029749 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31022749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15514874 + 15514875.

It is an arithmetic number, because the mean of its divisors is an integer number (15514875).

Almost surely, 2^31029749 is an apocalyptic number.

It is an amenable number.

31029749 is a deficient number, since it is larger than the sum of its proper divisors (1).

31029749 is an equidigital number, since it uses as much as digits as its factorization.

31029749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 31029749 is about 5570.4352612700. The cubic root of 31029749 is about 314.2385201371.

The spelling of 31029749 in words is "thirty-one million, twenty-nine thousand, seven hundred forty-nine".