25974661 has 2 divisors, whose sum is σ = 25974662. Its totient is φ = 25974660.

The previous prime is 25974583. The next prime is 25974667. The reversal of 25974661 is 16647952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 5317636 = 4545^2 + 2306^2 .

It is a cyclic number.

It is not a de Polignac number, because 25974661 - 2⁹ = 25974149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25974667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12987330 + 12987331.

It is an arithmetic number, because the mean of its divisors is an integer number (12987331).

Almost surely, 2^25974661 is an apocalyptic number.

It is an amenable number.

25974661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25974661 is an equidigital number, since it uses as much as digits as its factorization.

25974661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 25974661 is about 5096.5342145423. The cubic root of 25974661 is about 296.1533362162.

The spelling of 25974661 in words is "twenty-five million, nine hundred seventy-four thousand, six hundred sixty-one".