25049681 has 2 divisors, whose sum is σ = 25049682. Its totient is φ = 25049680.

The previous prime is 25049671. The next prime is 25049683. The reversal of 25049681 is 18694052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23571025 + 1478656 = 4855^2 + 1216^2 .

It is a cyclic number.

It is not a de Polignac number, because 25049681 - 2¹⁰ = 25048657 is a prime.

It is a super-2 number, since 2×25049681² = 1254973036403522, which contains 22 as substring.

Together with 25049683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25049683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12524840 + 12524841.

It is an arithmetic number, because the mean of its divisors is an integer number (12524841).

Almost surely, 2^25049681 is an apocalyptic number.

It is an amenable number.

25049681 is a deficient number, since it is larger than the sum of its proper divisors (1).

25049681 is an equidigital number, since it uses as much as digits as its factorization.

25049681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 25049681 is about 5004.9656342477. The cubic root of 25049681 is about 292.5953364930.

The spelling of 25049681 in words is "twenty-five million, forty-nine thousand, six hundred eighty-one".