25331381 has 2 divisors, whose sum is σ = 25331382. Its totient is φ = 25331380.

The previous prime is 25331357. The next prime is 25331387. The reversal of 25331381 is 18313352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20557156 + 4774225 = 4534^2 + 2185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25331381 is a prime.

It is a super-2 number, since 2×25331381² = 1283357726734322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25331381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25331387) 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, 12665690 + 12665691.

It is an arithmetic number, because the mean of its divisors is an integer number (12665691).

Almost surely, 2^25331381 is an apocalyptic number.

It is an amenable number.

25331381 is a deficient number, since it is larger than the sum of its proper divisors (1).

25331381 is an equidigital number, since it uses as much as digits as its factorization.

25331381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 25331381 is about 5033.0290084600. The cubic root of 25331381 is about 293.6880590087.

The spelling of 25331381 in words is "twenty-five million, three hundred thirty-one thousand, three hundred eighty-one".