31252231 has 2 divisors, whose sum is σ = 31252232. Its totient is φ = 31252230.

The previous prime is 31252229. The next prime is 31252253. The reversal of 31252231 is 13225213.

It is a weak prime.

It is an emirp because it is prime and its reverse (13225213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31252231 - 2¹ = 31252229 is a prime.

It is a super-2 number, since 2×31252231² = 1953403884954722, which contains 22 as substring.

Together with 31252229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31252199 and 31252208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31252201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15626115 + 15626116.

It is an arithmetic number, because the mean of its divisors is an integer number (15626116).

Almost surely, 2^31252231 is an apocalyptic number.

31252231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31252231 is an equidigital number, since it uses as much as digits as its factorization.

31252231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 19.

The square root of 31252231 is about 5590.3694868944. The cubic root of 31252231 is about 314.9877579856.

Adding to 31252231 its reverse (13225213), we get a palindrome (44477444).

It can be divided in two parts, 3125 and 2231, that added together give a triangular number (5356 = T₁₀₃).

The spelling of 31252231 in words is "thirty-one million, two hundred fifty-two thousand, two hundred thirty-one".