25381639 has 2 divisors, whose sum is σ = 25381640. Its totient is φ = 25381638.

The previous prime is 25381619. The next prime is 25381651. The reversal of 25381639 is 93618352.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25381639 - 2⁵ = 25381607 is a prime.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 25381598 and 25381607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25381619) 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, 12690819 + 12690820.

It is an arithmetic number, because the mean of its divisors is an integer number (12690820).

Almost surely, 2^25381639 is an apocalyptic number.

25381639 is a deficient number, since it is larger than the sum of its proper divisors (1).

25381639 is an equidigital number, since it uses as much as digits as its factorization.

25381639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 37.

The square root of 25381639 is about 5038.0193528807. The cubic root of 25381639 is about 293.8821584897.

The spelling of 25381639 in words is "twenty-five million, three hundred eighty-one thousand, six hundred thirty-nine".