25429861 has 2 divisors, whose sum is σ = 25429862. Its totient is φ = 25429860.

The previous prime is 25429849. The next prime is 25429871. The reversal of 25429861 is 16892452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16248961 + 9180900 = 4031^2 + 3030^2 .

It is a cyclic number.

It is not a de Polignac number, because 25429861 - 2¹⁵ = 25397093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25429861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25429801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12714930 + 12714931.

It is an arithmetic number, because the mean of its divisors is an integer number (12714931).

Almost surely, 2^25429861 is an apocalyptic number.

It is an amenable number.

25429861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25429861 is an equidigital number, since it uses as much as digits as its factorization.

25429861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 37.

The square root of 25429861 is about 5042.8028912501. The cubic root of 25429861 is about 294.0681540979.

It can be divided in two parts, 2542 and 9861, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 25429861 in words is "twenty-five million, four hundred twenty-nine thousand, eight hundred sixty-one".