26591969 has 2 divisors, whose sum is σ = 26591970. Its totient is φ = 26591968.

The previous prime is 26591947. The next prime is 26591993. The reversal of 26591969 is 96919562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22202944 + 4389025 = 4712^2 + 2095^2 .

It is a cyclic number.

It is not a de Polignac number, because 26591969 - 2²⁰ = 25543393 is a prime.

It is a super-2 number, since 2×26591969² = 1414265630593922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26591909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13295984 + 13295985.

It is an arithmetic number, because the mean of its divisors is an integer number (13295985).

Almost surely, 2^26591969 is an apocalyptic number.

It is an amenable number.

26591969 is a deficient number, since it is larger than the sum of its proper divisors (1).

26591969 is an equidigital number, since it uses as much as digits as its factorization.

26591969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262440, while the sum is 47.

The square root of 26591969 is about 5156.7401524607. The cubic root of 26591969 is about 298.4810968298.

The spelling of 26591969 in words is "twenty-six million, five hundred ninety-one thousand, nine hundred sixty-nine".