25278901 has 2 divisors, whose sum is σ = 25278902. Its totient is φ = 25278900.

The previous prime is 25278889. The next prime is 25278907. The reversal of 25278901 is 10987252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25260676 + 18225 = 5026^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 25278901 - 2⁹ = 25278389 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25278907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12639450 + 12639451.

It is an arithmetic number, because the mean of its divisors is an integer number (12639451).

Almost surely, 2^25278901 is an apocalyptic number.

It is an amenable number.

25278901 is a deficient number, since it is larger than the sum of its proper divisors (1).

25278901 is an equidigital number, since it uses as much as digits as its factorization.

25278901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 25278901 is about 5027.8127451209. The cubic root of 25278901 is about 293.4851038239.

The spelling of 25278901 in words is "twenty-five million, two hundred seventy-eight thousand, nine hundred one".