25431397 has 2 divisors, whose sum is σ = 25431398. Its totient is φ = 25431396.

The previous prime is 25431383. The next prime is 25431401. The reversal of 25431397 is 79313452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24295041 + 1136356 = 4929^2 + 1066^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25431397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25431317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12715698 + 12715699.

It is an arithmetic number, because the mean of its divisors is an integer number (12715699).

Almost surely, 2^25431397 is an apocalyptic number.

It is an amenable number.

25431397 is a deficient number, since it is larger than the sum of its proper divisors (1).

25431397 is an equidigital number, since it uses as much as digits as its factorization.

25431397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 34.

The square root of 25431397 is about 5042.9551852064. The cubic root of 25431397 is about 294.0740746911.

The spelling of 25431397 in words is "twenty-five million, four hundred thirty-one thousand, three hundred ninety-seven".