31225247 has 2 divisors, whose sum is σ = 31225248. Its totient is φ = 31225246.

The previous prime is 31225213. The next prime is 31225273. The reversal of 31225247 is 74252213.

It is an a-pointer prime, because the next prime (31225273) can be obtained adding 31225247 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31225247 is a prime.

It is a super-2 number, since 2×31225247² = 1950032100422018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31225147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15612623 + 15612624.

It is an arithmetic number, because the mean of its divisors is an integer number (15612624).

Almost surely, 2^31225247 is an apocalyptic number.

31225247 is a deficient number, since it is larger than the sum of its proper divisors (1).

31225247 is an equidigital number, since it uses as much as digits as its factorization.

31225247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 26.

The square root of 31225247 is about 5587.9555295296. The cubic root of 31225247 is about 314.8970756372.

The spelling of 31225247 in words is "thirty-one million, two hundred twenty-five thousand, two hundred forty-seven".