25042981 has 2 divisors, whose sum is σ = 25042982. Its totient is φ = 25042980.

The previous prime is 25042973. The next prime is 25042987. The reversal of 25042981 is 18924052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18105025 + 6937956 = 4255^2 + 2634^2 .

It is a cyclic number.

It is not a de Polignac number, because 25042981 - 2³ = 25042973 is a prime.

It is a super-2 number, since 2×25042981² = 1254301794732722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25042987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12521490 + 12521491.

It is an arithmetic number, because the mean of its divisors is an integer number (12521491).

Almost surely, 2^25042981 is an apocalyptic number.

It is an amenable number.

25042981 is a deficient number, since it is larger than the sum of its proper divisors (1).

25042981 is an equidigital number, since it uses as much as digits as its factorization.

25042981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 25042981 is about 5004.2962542200. The cubic root of 25042981 is about 292.5692474907.

The spelling of 25042981 in words is "twenty-five million, forty-two thousand, nine hundred eighty-one".