26431262009 has 2 divisors, whose sum is σ = 26431262010. Its totient is φ = 26431262008.

The previous prime is 26431261993. The next prime is 26431262027. The reversal of 26431262009 is 90026213462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26425753600 + 5508409 = 162560^2 + 2347^2 .

It is a cyclic number.

It is not a de Polignac number, because 26431262009 - 2⁴ = 26431261993 is a prime.

It is a super-3 number, since 3×26431262009³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 26431262009.

It is not a weakly prime, because it can be changed into another prime (26431262309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13215631004 + 13215631005.

It is an arithmetic number, because the mean of its divisors is an integer number (13215631005).

Almost surely, 2^26431262009 is an apocalyptic number.

It is an amenable number.

26431262009 is a deficient number, since it is larger than the sum of its proper divisors (1).

26431262009 is an equidigital number, since it uses as much as digits as its factorization.

26431262009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 26431262009 in words is "twenty-six billion, four hundred thirty-one million, two hundred sixty-two thousand, nine".