31012013 has 2 divisors, whose sum is σ = 31012014. Its totient is φ = 31012012.

The previous prime is 31012001. The next prime is 31012021. The reversal of 31012013 is 31021013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20912329 + 10099684 = 4573^2 + 3178^2 .

It is an emirp because it is prime and its reverse (31021013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31012013 - 2¹² = 31007917 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31011985 and 31012003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31012043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506006 + 15506007.

It is an arithmetic number, because the mean of its divisors is an integer number (15506007).

Almost surely, 2^31012013 is an apocalyptic number.

It is an amenable number.

31012013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012013 is an equidigital number, since it uses as much as digits as its factorization.

31012013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 31012013 is about 5568.8430575839. The cubic root of 31012013 is about 314.1786378544.

Adding to 31012013 its reverse (31021013), we get a palindrome (62033026).

The spelling of 31012013 in words is "thirty-one million, twelve thousand, thirteen".