26212009 has 2 divisors, whose sum is σ = 26212010. Its totient is φ = 26212008.

The previous prime is 26212007. The next prime is 26212049. The reversal of 26212009 is 90021262.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25280784 + 931225 = 5028^2 + 965^2 .

It is a cyclic number.

It is not a de Polignac number, because 26212009 - 2¹ = 26212007 is a prime.

Together with 26212007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (26212003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13106004 + 13106005.

It is an arithmetic number, because the mean of its divisors is an integer number (13106005).

Almost surely, 2^26212009 is an apocalyptic number.

It is an amenable number.

26212009 is a deficient number, since it is larger than the sum of its proper divisors (1).

26212009 is an equidigital number, since it uses as much as digits as its factorization.

26212009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 26212009 is about 5119.7664985817. The cubic root of 26212009 is about 297.0526534694.

The spelling of 26212009 in words is "twenty-six million, two hundred twelve thousand, nine".