25443581 has 2 divisors, whose sum is σ = 25443582. Its totient is φ = 25443580.

The previous prime is 25443569. The next prime is 25443599. The reversal of 25443581 is 18534452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14822500 + 10621081 = 3850^2 + 3259^2 .

It is a cyclic number.

It is not a de Polignac number, because 25443581 - 2¹⁴ = 25427197 is a prime.

It is a super-2 number, since 2×25443581² = 1294751628207122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25443881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12721790 + 12721791.

It is an arithmetic number, because the mean of its divisors is an integer number (12721791).

Almost surely, 2^25443581 is an apocalyptic number.

It is an amenable number.

25443581 is a deficient number, since it is larger than the sum of its proper divisors (1).

25443581 is an equidigital number, since it uses as much as digits as its factorization.

25443581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 32.

The square root of 25443581 is about 5044.1630623920. The cubic root of 25443581 is about 294.1210301203.

The spelling of 25443581 in words is "twenty-five million, four hundred forty-three thousand, five hundred eighty-one".