31263313 has 2 divisors, whose sum is σ = 31263314. Its totient is φ = 31263312.

The previous prime is 31263307. The next prime is 31263377. The reversal of 31263313 is 31336213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28804689 + 2458624 = 5367^2 + 1568^2 .

It is an emirp because it is prime and its reverse (31336213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31263313 - 2⁹ = 31262801 is a prime.

It is not a weakly prime, because it can be changed into another prime (31263913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15631656 + 15631657.

It is an arithmetic number, because the mean of its divisors is an integer number (15631657).

Almost surely, 2^31263313 is an apocalyptic number.

It is an amenable number.

31263313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31263313 is an equidigital number, since it uses as much as digits as its factorization.

31263313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 22.

The square root of 31263313 is about 5591.3605678761. The cubic root of 31263313 is about 315.0249850006.

Adding to 31263313 its reverse (31336213), we get a palindrome (62599526).

Subtracting 31263313 from its reverse (31336213), we obtain a square (72900 = 270²).

The spelling of 31263313 in words is "thirty-one million, two hundred sixty-three thousand, three hundred thirteen".