25849949 has 2 divisors, whose sum is σ = 25849950. Its totient is φ = 25849948.

The previous prime is 25849921. The next prime is 25849973. The reversal of 25849949 is 94994852.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24304900 + 1545049 = 4930^2 + 1243^2 .

It is a cyclic number.

It is not a de Polignac number, because 25849949 - 2²⁰ = 24801373 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25849897 and 25849906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25849919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12924974 + 12924975.

It is an arithmetic number, because the mean of its divisors is an integer number (12924975).

Almost surely, 2^25849949 is an apocalyptic number.

It is an amenable number.

25849949 is a deficient number, since it is larger than the sum of its proper divisors (1).

25849949 is an equidigital number, since it uses as much as digits as its factorization.

25849949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 50.

The square root of 25849949 is about 5084.2845121020. The cubic root of 25849949 is about 295.6786024852.

The spelling of 25849949 in words is "twenty-five million, eight hundred forty-nine thousand, nine hundred forty-nine".