31243253 has 2 divisors, whose sum is σ = 31243254. Its totient is φ = 31243252.

The previous prime is 31243249. The next prime is 31243279. The reversal of 31243253 is 35234213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30393169 + 850084 = 5513^2 + 922^2 .

It is a cyclic number.

It is not a de Polignac number, because 31243253 - 2² = 31243249 is a prime.

It is a super-2 number, since 2×31243253² = 1952281716044018, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_1930019 and since 31243253 and 1930019 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31243213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15621626 + 15621627.

It is an arithmetic number, because the mean of its divisors is an integer number (15621627).

Almost surely, 2^31243253 is an apocalyptic number.

It is an amenable number.

31243253 is a deficient number, since it is larger than the sum of its proper divisors (1).

31243253 is an equidigital number, since it uses as much as digits as its factorization.

31243253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 23.

The square root of 31243253 is about 5589.5664411473. The cubic root of 31243253 is about 314.9575923426.

Adding to 31243253 its reverse (35234213), we get a palindrome (66477466).

The spelling of 31243253 in words is "thirty-one million, two hundred forty-three thousand, two hundred fifty-three".