25436381 has 2 divisors, whose sum is σ = 25436382. Its totient is φ = 25436380.

The previous prime is 25436317. The next prime is 25436419. The reversal of 25436381 is 18363452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24344356 + 1092025 = 4934^2 + 1045^2 .

It is a cyclic number.

It is not a de Polignac number, because 25436381 - 2⁶ = 25436317 is a prime.

It is a super-2 number, since 2×25436381² = 1294018956754322, which contains 22 as substring.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25436881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12718190 + 12718191.

It is an arithmetic number, because the mean of its divisors is an integer number (12718191).

Almost surely, 2^25436381 is an apocalyptic number.

It is an amenable number.

25436381 is a deficient number, since it is larger than the sum of its proper divisors (1).

25436381 is an equidigital number, since it uses as much as digits as its factorization.

25436381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 25436381 is about 5043.4493156966. The cubic root of 25436381 is about 294.0932841412.

The spelling of 25436381 in words is "twenty-five million, four hundred thirty-six thousand, three hundred eighty-one".