25981429 has 2 divisors, whose sum is σ = 25981430. Its totient is φ = 25981428.

The previous prime is 25981427. The next prime is 25981447. The reversal of 25981429 is 92418952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16184529 + 9796900 = 4023^2 + 3130^2 .

It is a cyclic number.

It is not a de Polignac number, because 25981429 - 2¹ = 25981427 is a prime.

Together with 25981427, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 25981391 and 25981400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25981427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12990714 + 12990715.

It is an arithmetic number, because the mean of its divisors is an integer number (12990715).

Almost surely, 2^25981429 is an apocalyptic number.

It is an amenable number.

25981429 is a deficient number, since it is larger than the sum of its proper divisors (1).

25981429 is an equidigital number, since it uses as much as digits as its factorization.

25981429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 25981429 is about 5097.1981519262. The cubic root of 25981429 is about 296.1790560477.

The spelling of 25981429 in words is "twenty-five million, nine hundred eighty-one thousand, four hundred twenty-nine".