26490509 has 2 divisors, whose sum is σ = 26490510. Its totient is φ = 26490508.

The previous prime is 26490493. The next prime is 26490533. The reversal of 26490509 is 90509462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15288100 + 11202409 = 3910^2 + 3347^2 .

It is a cyclic number.

It is not a de Polignac number, because 26490509 - 2⁴ = 26490493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26490599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13245254 + 13245255.

It is an arithmetic number, because the mean of its divisors is an integer number (13245255).

Almost surely, 2^26490509 is an apocalyptic number.

It is an amenable number.

26490509 is a deficient number, since it is larger than the sum of its proper divisors (1).

26490509 is an equidigital number, since it uses as much as digits as its factorization.

26490509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 26490509 is about 5146.8931405266. The cubic root of 26490509 is about 298.1010010026.

The spelling of 26490509 in words is "twenty-six million, four hundred ninety thousand, five hundred nine".