25400009 has 2 divisors, whose sum is σ = 25400010. Its totient is φ = 25400008.

The previous prime is 25400003. The next prime is 25400021. The reversal of 25400009 is 90000452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19891600 + 5508409 = 4460^2 + 2347^2 .

It is a cyclic number.

It is not a de Polignac number, because 25400009 - 2²⁴ = 8622793 is a prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (25400003) 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, 12700004 + 12700005.

It is an arithmetic number, because the mean of its divisors is an integer number (12700005).

Almost surely, 2^25400009 is an apocalyptic number.

It is an amenable number.

25400009 is a deficient number, since it is larger than the sum of its proper divisors (1).

25400009 is an equidigital number, since it uses as much as digits as its factorization.

25400009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 25400009 is about 5039.8421602268. The cubic root of 25400009 is about 293.9530406124.

The spelling of 25400009 in words is "twenty-five million, four hundred thousand, nine".