25431401 has 2 divisors, whose sum is σ = 25431402. Its totient is φ = 25431400.

The previous prime is 25431397. The next prime is 25431407. The reversal of 25431401 is 10413452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22316176 + 3115225 = 4724^2 + 1765^2 .

It is a cyclic number.

It is not a de Polignac number, because 25431401 - 2² = 25431397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_1591130 and since 25431401 and 1591130 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (25431407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12715700 + 12715701.

It is an arithmetic number, because the mean of its divisors is an integer number (12715701).

Almost surely, 2^25431401 is an apocalyptic number.

It is an amenable number.

25431401 is a deficient number, since it is larger than the sum of its proper divisors (1).

25431401 is an equidigital number, since it uses as much as digits as its factorization.

25431401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 25431401 is about 5042.9555817992. The cubic root of 25431401 is about 294.0740901090.

Adding to 25431401 its reverse (10413452), we get a palindrome (35844853).

The spelling of 25431401 in words is "twenty-five million, four hundred thirty-one thousand, four hundred one".