25449409 has 2 divisors, whose sum is σ = 25449410. Its totient is φ = 25449408.

The previous prime is 25449401. The next prime is 25449427. The reversal of 25449409 is 90494452.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19184400 + 6265009 = 4380^2 + 2503^2 .

It is a cyclic number.

It is not a de Polignac number, because 25449409 - 2³ = 25449401 is a prime.

It is not a weakly prime, because it can be changed into another prime (25449401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12724704 + 12724705.

It is an arithmetic number, because the mean of its divisors is an integer number (12724705).

Almost surely, 2^25449409 is an apocalyptic number.

It is an amenable number.

25449409 is a deficient number, since it is larger than the sum of its proper divisors (1).

25449409 is an equidigital number, since it uses as much as digits as its factorization.

25449409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 25449409 is about 5044.7407267371. The cubic root of 25449409 is about 294.1434851160.

The spelling of 25449409 in words is "twenty-five million, four hundred forty-nine thousand, four hundred nine".