25821937 has 2 divisors, whose sum is σ = 25821938. Its totient is φ = 25821936.

The previous prime is 25821899. The next prime is 25821949. The reversal of 25821937 is 73912852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20875761 + 4946176 = 4569^2 + 2224^2 .

It is a cyclic number.

It is not a de Polignac number, because 25821937 - 2²³ = 17433329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25821896 and 25821905.

It is not a weakly prime, because it can be changed into another prime (25821137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12910968 + 12910969.

It is an arithmetic number, because the mean of its divisors is an integer number (12910969).

Almost surely, 2^25821937 is an apocalyptic number.

It is an amenable number.

25821937 is a deficient number, since it is larger than the sum of its proper divisors (1).

25821937 is an equidigital number, since it uses as much as digits as its factorization.

25821937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 25821937 is about 5081.5290021803. The cubic root of 25821937 is about 295.5717609775.

The spelling of 25821937 in words is "twenty-five million, eight hundred twenty-one thousand, nine hundred thirty-seven".