31349231 has 2 divisors, whose sum is σ = 31349232. Its totient is φ = 31349230.

The previous prime is 31349191. The next prime is 31349257. The reversal of 31349231 is 13294313.

It is a happy number.

It is an a-pointer prime, because the next prime (31349257) can be obtained adding 31349231 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31349231 - 2⁶ = 31349167 is a prime.

It is a super-2 number, since 2×31349231² = 1965548568582722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31349231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31349831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15674615 + 15674616.

It is an arithmetic number, because the mean of its divisors is an integer number (15674616).

Almost surely, 2^31349231 is an apocalyptic number.

31349231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31349231 is an equidigital number, since it uses as much as digits as its factorization.

31349231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 26.

The square root of 31349231 is about 5599.0383995826. The cubic root of 31349231 is about 315.3133054766.

The spelling of 31349231 in words is "thirty-one million, three hundred forty-nine thousand, two hundred thirty-one".