25643311 has 2 divisors, whose sum is σ = 25643312. Its totient is φ = 25643310.

The previous prime is 25643297. The next prime is 25643329. The reversal of 25643311 is 11334652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25643311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25643911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12821655 + 12821656.

It is an arithmetic number, because the mean of its divisors is an integer number (12821656).

Almost surely, 2^25643311 is an apocalyptic number.

25643311 is a deficient number, since it is larger than the sum of its proper divisors (1).

25643311 is an equidigital number, since it uses as much as digits as its factorization.

25643311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 25643311 is about 5063.9224915079. The cubic root of 25643311 is about 294.8886336309. Note that the first 3 decimals are identical.

Adding to 25643311 its reverse (11334652), we get a palindrome (36977963).

The spelling of 25643311 in words is "twenty-five million, six hundred forty-three thousand, three hundred eleven".