26890261 has 2 divisors, whose sum is σ = 26890262. Its totient is φ = 26890260.

The previous prime is 26890247. The next prime is 26890267. The reversal of 26890261 is 16209862.

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., 26071236 + 819025 = 5106^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 26890261 - 2⁵ = 26890229 is a prime.

It is a super-2 number, since 2×26890261² = 1446172273296242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26890267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13445130 + 13445131.

It is an arithmetic number, because the mean of its divisors is an integer number (13445131).

Almost surely, 2^26890261 is an apocalyptic number.

It is an amenable number.

26890261 is a deficient number, since it is larger than the sum of its proper divisors (1).

26890261 is an equidigital number, since it uses as much as digits as its factorization.

26890261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 26890261 is about 5185.5820309778. The cubic root of 26890261 is about 299.5930073656.

The spelling of 26890261 in words is "twenty-six million, eight hundred ninety thousand, two hundred sixty-one".