26500813 has 2 divisors, whose sum is σ = 26500814. Its totient is φ = 26500812.

The previous prime is 26500811. The next prime is 26500823. The reversal of 26500813 is 31800562.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22448644 + 4052169 = 4738^2 + 2013^2 .

It is a cyclic number.

It is not a de Polignac number, because 26500813 - 2¹ = 26500811 is a prime.

Together with 26500811, it forms a pair of twin primes.

26500813 is a modest number, since divided by 813 gives 265 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26500811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13250406 + 13250407.

It is an arithmetic number, because the mean of its divisors is an integer number (13250407).

Almost surely, 2^26500813 is an apocalyptic number.

It is an amenable number.

26500813 is a deficient number, since it is larger than the sum of its proper divisors (1).

26500813 is an equidigital number, since it uses as much as digits as its factorization.

26500813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 26500813 is about 5147.8940354285. The cubic root of 26500813 is about 298.1396467246.

The spelling of 26500813 in words is "twenty-six million, five hundred thousand, eight hundred thirteen".