31289413 has 2 divisors, whose sum is σ = 31289414. Its totient is φ = 31289412.

The previous prime is 31289393. The next prime is 31289417. The reversal of 31289413 is 31498213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27217089 + 4072324 = 5217^2 + 2018^2 .

It is an emirp because it is prime and its reverse (31498213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31289413 - 2⁵ = 31289381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31289417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15644706 + 15644707.

It is an arithmetic number, because the mean of its divisors is an integer number (15644707).

Almost surely, 2^31289413 is an apocalyptic number.

It is an amenable number.

31289413 is a deficient number, since it is larger than the sum of its proper divisors (1).

31289413 is an equidigital number, since it uses as much as digits as its factorization.

31289413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 31289413 is about 5593.6940388262. The cubic root of 31289413 is about 315.1126262251.

It can be divided in two parts, 31 and 289413, that added together give a square (289444 = 538²).

The spelling of 31289413 in words is "thirty-one million, two hundred eighty-nine thousand, four hundred thirteen".