25351409 has 2 divisors, whose sum is σ = 25351410. Its totient is φ = 25351408.

The previous prime is 25351399. The next prime is 25351411. The reversal of 25351409 is 90415352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22278400 + 3073009 = 4720^2 + 1753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25351409 is a prime.

It is a Sophie Germain prime.

Together with 25351411, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25351429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12675704 + 12675705.

It is an arithmetic number, because the mean of its divisors is an integer number (12675705).

Almost surely, 2^25351409 is an apocalyptic number.

It is an amenable number.

25351409 is a deficient number, since it is larger than the sum of its proper divisors (1).

25351409 is an equidigital number, since it uses as much as digits as its factorization.

25351409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 25351409 is about 5035.0182720622. The cubic root of 25351409 is about 293.7654391161.

The spelling of 25351409 in words is "twenty-five million, three hundred fifty-one thousand, four hundred nine".