31290029 has 2 divisors, whose sum is σ = 31290030. Its totient is φ = 31290028.

The previous prime is 31290023. The next prime is 31290059. The reversal of 31290029 is 92009213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25050025 + 6240004 = 5005^2 + 2498^2 .

It is an emirp because it is prime and its reverse (92009213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31290029 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31290023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15645014 + 15645015.

It is an arithmetic number, because the mean of its divisors is an integer number (15645015).

Almost surely, 2^31290029 is an apocalyptic number.

It is an amenable number.

31290029 is a deficient number, since it is larger than the sum of its proper divisors (1).

31290029 is an equidigital number, since it uses as much as digits as its factorization.

31290029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 31290029 is about 5593.7491005586. The cubic root of 31290029 is about 315.1146941035.

The spelling of 31290029 in words is "thirty-one million, two hundred ninety thousand, twenty-nine".