25278049 has 2 divisors, whose sum is σ = 25278050. Its totient is φ = 25278048.

The previous prime is 25277971. The next prime is 25278079. The reversal of 25278049 is 94087252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19421649 + 5856400 = 4407^2 + 2420^2 .

It is a cyclic number.

It is not a de Polignac number, because 25278049 - 2⁹ = 25277537 is a prime.

It is a super-2 number, since 2×25278049² = 1277959522492802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25277999 and 25278017.

It is not a weakly prime, because it can be changed into another prime (25278079) 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, 12639024 + 12639025.

It is an arithmetic number, because the mean of its divisors is an integer number (12639025).

Almost surely, 2^25278049 is an apocalyptic number.

It is an amenable number.

25278049 is a deficient number, since it is larger than the sum of its proper divisors (1).

25278049 is an equidigital number, since it uses as much as digits as its factorization.

25278049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 25278049 is about 5027.7280157145. The cubic root of 25278049 is about 293.4818065799.

The spelling of 25278049 in words is "twenty-five million, two hundred seventy-eight thousand, forty-nine".