25280081 has 2 divisors, whose sum is σ = 25280082. Its totient is φ = 25280080.

The previous prime is 25280077. The next prime is 25280113. The reversal of 25280081 is 18008252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24167056 + 1113025 = 4916^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 25280081 - 2² = 25280077 is a prime.

It is a super-2 number, since 2×25280081² = 1278164990733122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25280081.

It is not a weakly prime, because it can be changed into another prime (25280041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12640040 + 12640041.

It is an arithmetic number, because the mean of its divisors is an integer number (12640041).

Almost surely, 2^25280081 is an apocalyptic number.

It is an amenable number.

25280081 is a deficient number, since it is larger than the sum of its proper divisors (1).

25280081 is an equidigital number, since it uses as much as digits as its factorization.

25280081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 25280081 is about 5027.9300910017. The cubic root of 25280081 is about 293.4896703072.

It can be divided in two parts, 252800 and 81, that multiplied together give a triangular number (20476800 = T₆₃₉₉).

The spelling of 25280081 in words is "twenty-five million, two hundred eighty thousand, eighty-one".