26999813 has 2 divisors, whose sum is σ = 26999814. Its totient is φ = 26999812.

The previous prime is 26999803. The next prime is 26999821. The reversal of 26999813 is 31899962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26853124 + 146689 = 5182^2 + 383^2 .

It is a cyclic number.

It is not a de Polignac number, because 26999813 - 2¹⁶ = 26934277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26999803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13499906 + 13499907.

It is an arithmetic number, because the mean of its divisors is an integer number (13499907).

Almost surely, 2^26999813 is an apocalyptic number.

It is an amenable number.

26999813 is a deficient number, since it is larger than the sum of its proper divisors (1).

26999813 is an equidigital number, since it uses as much as digits as its factorization.

26999813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 26999813 is about 5196.1344285921. The cubic root of 26999813 is about 299.9993074058. Note that the first 3 decimals are identical.

The spelling of 26999813 in words is "twenty-six million, nine hundred ninety-nine thousand, eight hundred thirteen".