31123369 has 2 divisors, whose sum is σ = 31123370. Its totient is φ = 31123368.

The previous prime is 31123361. The next prime is 31123397. The reversal of 31123369 is 96332113.

It is an a-pointer prime, because the next prime (31123397) can be obtained adding 31123369 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30946969 + 176400 = 5563^2 + 420^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123369 - 2³ = 31123361 is a prime.

It is a super-2 number, since 2×31123369² = 1937328195820322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31123361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561684 + 15561685.

It is an arithmetic number, because the mean of its divisors is an integer number (15561685).

Almost surely, 2^31123369 is an apocalyptic number.

It is an amenable number.

31123369 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123369 is an equidigital number, since it uses as much as digits as its factorization.

31123369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 28.

The square root of 31123369 is about 5578.8322254751. The cubic root of 31123369 is about 314.5542330035.

The spelling of 31123369 in words is "thirty-one million, one hundred twenty-three thousand, three hundred sixty-nine".