26689261 has 2 divisors, whose sum is σ = 26689262. Its totient is φ = 26689260.

The previous prime is 26689217. The next prime is 26689277. The reversal of 26689261 is 16298662.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15163236 + 11526025 = 3894^2 + 3395^2 .

It is a cyclic number.

It is not a de Polignac number, because 26689261 - 2¹⁹ = 26164973 is a prime.

It is a super-2 number, since 2×26689261² = 1424633305452242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26689211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13344630 + 13344631.

It is an arithmetic number, because the mean of its divisors is an integer number (13344631).

Almost surely, 2^26689261 is an apocalyptic number.

It is an amenable number.

26689261 is a deficient number, since it is larger than the sum of its proper divisors (1).

26689261 is an equidigital number, since it uses as much as digits as its factorization.

26689261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 26689261 is about 5166.1650186575. The cubic root of 26689261 is about 298.8446712446.

The spelling of 26689261 in words is "twenty-six million, six hundred eighty-nine thousand, two hundred sixty-one".