31089013 has 2 divisors, whose sum is σ = 31089014. Its totient is φ = 31089012.

The previous prime is 31089011. The next prime is 31089049. The reversal of 31089013 is 31098013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28708164 + 2380849 = 5358^2 + 1543^2 .

It is an emirp because it is prime and its reverse (31098013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31089013 - 2¹ = 31089011 is a prime.

Together with 31089011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31089011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15544506 + 15544507.

It is an arithmetic number, because the mean of its divisors is an integer number (15544507).

Almost surely, 2^31089013 is an apocalyptic number.

It is an amenable number.

31089013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31089013 is an equidigital number, since it uses as much as digits as its factorization.

31089013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 31089013 is about 5575.7522362458. The cubic root of 31089013 is about 314.4384485791.

It can be divided in two parts, 3108 and 9013, that added together give a palindrome (12121).

The spelling of 31089013 in words is "thirty-one million, eighty-nine thousand, thirteen".