25601861 has 2 divisors, whose sum is σ = 25601862. Its totient is φ = 25601860.

The previous prime is 25601837. The next prime is 25601869. The reversal of 25601861 is 16810652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20079361 + 5522500 = 4481^2 + 2350^2 .

It is a cyclic number.

It is not a de Polignac number, because 25601861 - 2¹⁴ = 25585477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25601869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12800930 + 12800931.

It is an arithmetic number, because the mean of its divisors is an integer number (12800931).

Almost surely, 2^25601861 is an apocalyptic number.

It is an amenable number.

25601861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25601861 is an equidigital number, since it uses as much as digits as its factorization.

25601861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 25601861 is about 5059.8281591374. The cubic root of 25601861 is about 294.7296613667.

It can be divided in two parts, 25601 and 861, that added together give a palindrome (26462).

The spelling of 25601861 in words is "twenty-five million, six hundred one thousand, eight hundred sixty-one".