25378121 has 2 divisors, whose sum is σ = 25378122. Its totient is φ = 25378120.

The previous prime is 25378109. The next prime is 25378123. The reversal of 25378121 is 12187352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25351225 + 26896 = 5035^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 25378121 - 2¹⁰ = 25377097 is a prime.

Together with 25378123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25378123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12689060 + 12689061.

It is an arithmetic number, because the mean of its divisors is an integer number (12689061).

Almost surely, 2^25378121 is an apocalyptic number.

It is an amenable number.

25378121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25378121 is an equidigital number, since it uses as much as digits as its factorization.

25378121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 29.

The square root of 25378121 is about 5037.6701956361. The cubic root of 25378121 is about 293.8685801020.

The spelling of 25378121 in words is "twenty-five million, three hundred seventy-eight thousand, one hundred twenty-one".