26809961 has 2 divisors, whose sum is σ = 26809962. Its totient is φ = 26809960.

The previous prime is 26809943. The next prime is 26809963. The reversal of 26809961 is 16990862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26584336 + 225625 = 5156^2 + 475^2 .

It is a cyclic number.

It is not a de Polignac number, because 26809961 - 2⁶ = 26809897 is a prime.

Together with 26809963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26809963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13404980 + 13404981.

It is an arithmetic number, because the mean of its divisors is an integer number (13404981).

Almost surely, 2^26809961 is an apocalyptic number.

It is an amenable number.

26809961 is a deficient number, since it is larger than the sum of its proper divisors (1).

26809961 is an equidigital number, since it uses as much as digits as its factorization.

26809961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 26809961 is about 5177.8336203474. The cubic root of 26809961 is about 299.2944940235.

The spelling of 26809961 in words is "twenty-six million, eight hundred nine thousand, nine hundred sixty-one".