25078421 has 2 divisors, whose sum is σ = 25078422. Its totient is φ = 25078420.

The previous prime is 25078399. The next prime is 25078433. The reversal of 25078421 is 12487052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21022225 + 4056196 = 4585^2 + 2014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25078421 is a prime.

It is a Chen prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25078121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12539210 + 12539211.

It is an arithmetic number, because the mean of its divisors is an integer number (12539211).

Almost surely, 2^25078421 is an apocalyptic number.

It is an amenable number.

25078421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25078421 is an equidigital number, since it uses as much as digits as its factorization.

25078421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 25078421 is about 5007.8359597734. The cubic root of 25078421 is about 292.7071938857.

The spelling of 25078421 in words is "twenty-five million, seventy-eight thousand, four hundred twenty-one".