31317269 has 2 divisors, whose sum is σ = 31317270. Its totient is φ = 31317268.

The previous prime is 31317257. The next prime is 31317271. The reversal of 31317269 is 96271313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31248100 + 69169 = 5590^2 + 263^2 .

It is an emirp because it is prime and its reverse (96271313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31317269 is a prime.

It is a super-2 number, since 2×31317269² = 1961542675236722, which contains 22 as substring.

Together with 31317271, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31317229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15658634 + 15658635.

It is an arithmetic number, because the mean of its divisors is an integer number (15658635).

Almost surely, 2^31317269 is an apocalyptic number.

It is an amenable number.

31317269 is a deficient number, since it is larger than the sum of its proper divisors (1).

31317269 is an equidigital number, since it uses as much as digits as its factorization.

31317269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 32.

The square root of 31317269 is about 5596.1834315898. The cubic root of 31317269 is about 315.2061101749.

The spelling of 31317269 in words is "thirty-one million, three hundred seventeen thousand, two hundred sixty-nine".