25537861 has 2 divisors, whose sum is σ = 25537862. Its totient is φ = 25537860.

The previous prime is 25537849. The next prime is 25537871. The reversal of 25537861 is 16873552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 5377761 = 4490^2 + 2319^2 .

It is a cyclic number.

It is not a de Polignac number, because 25537861 - 2¹¹ = 25535813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25537861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25537801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12768930 + 12768931.

It is an arithmetic number, because the mean of its divisors is an integer number (12768931).

Almost surely, 2^25537861 is an apocalyptic number.

It is an amenable number.

25537861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25537861 is an equidigital number, since it uses as much as digits as its factorization.

25537861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 25537861 is about 5053.4998763233. The cubic root of 25537861 is about 294.4838662406.

The spelling of 25537861 in words is "twenty-five million, five hundred thirty-seven thousand, eight hundred sixty-one".