25732813 has 2 divisors, whose sum is σ = 25732814. Its totient is φ = 25732812.

The previous prime is 25732801. The next prime is 25732823. The reversal of 25732813 is 31823752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17455684 + 8277129 = 4178^2 + 2877^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25732813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25732823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12866406 + 12866407.

It is an arithmetic number, because the mean of its divisors is an integer number (12866407).

Almost surely, 2^25732813 is an apocalyptic number.

25732813 is the 2712-nd centered heptagonal number.

It is an amenable number.

25732813 is a deficient number, since it is larger than the sum of its proper divisors (1).

25732813 is an equidigital number, since it uses as much as digits as its factorization.

25732813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 25732813 is about 5072.7520144395. The cubic root of 25732813 is about 295.2313152701.

The spelling of 25732813 in words is "twenty-five million, seven hundred thirty-two thousand, eight hundred thirteen".