25712213 has 2 divisors, whose sum is σ = 25712214. Its totient is φ = 25712212.

The previous prime is 25712201. The next prime is 25712227. The reversal of 25712213 is 31221752.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20133169 + 5579044 = 4487^2 + 2362^2 .

It is a cyclic number.

It is not a de Polignac number, because 25712213 - 2¹² = 25708117 is a prime.

It is a super-2 number, since 2×25712213² = 1322235794714738, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_1607612 and since 25712213 and 1607612 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 (25712233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12856106 + 12856107.

It is an arithmetic number, because the mean of its divisors is an integer number (12856107).

Almost surely, 2^25712213 is an apocalyptic number.

It is an amenable number.

25712213 is a deficient number, since it is larger than the sum of its proper divisors (1).

25712213 is an equidigital number, since it uses as much as digits as its factorization.

25712213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 23.

The square root of 25712213 is about 5070.7211518678. The cubic root of 25712213 is about 295.1525133049.

Adding to 25712213 its reverse (31221752), we get a palindrome (56933965).

The spelling of 25712213 in words is "twenty-five million, seven hundred twelve thousand, two hundred thirteen".