25444981 has 2 divisors, whose sum is σ = 25444982. Its totient is φ = 25444980.

The previous prime is 25444973. The next prime is 25445027. The reversal of 25444981 is 18944452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19847025 + 5597956 = 4455^2 + 2366^2 .

It is a cyclic number.

It is not a de Polignac number, because 25444981 - 2³ = 25444973 is a prime.

It is a super-2 number, since 2×25444981² = 1294894116180722, 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 25444981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25444901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12722490 + 12722491.

It is an arithmetic number, because the mean of its divisors is an integer number (12722491).

Almost surely, 2^25444981 is an apocalyptic number.

It is an amenable number.

25444981 is a deficient number, since it is larger than the sum of its proper divisors (1).

25444981 is an equidigital number, since it uses as much as digits as its factorization.

25444981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 37.

The square root of 25444981 is about 5044.3018347438. The cubic root of 25444981 is about 294.1264245639.

The spelling of 25444981 in words is "twenty-five million, four hundred forty-four thousand, nine hundred eighty-one".