10505272909 has 2 divisors, whose sum is σ = 10505272910. Its totient is φ = 10505272908.

The previous prime is 10505272891. The next prime is 10505272937. The reversal of 10505272909 is 90927250501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10007001225 + 498271684 = 100035^2 + 22322^2 .

It is a cyclic number.

It is not a de Polignac number, because 10505272909 - 2²¹ = 10503175757 is a prime.

It is a super-2 number, since 2×10505272909² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10505272949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252636454 + 5252636455.

It is an arithmetic number, because the mean of its divisors is an integer number (5252636455).

Almost surely, 2^10505272909 is an apocalyptic number.

It is an amenable number.

10505272909 is a deficient number, since it is larger than the sum of its proper divisors (1).

10505272909 is an equidigital number, since it uses as much as digits as its factorization.

10505272909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 40.

The spelling of 10505272909 in words is "ten billion, five hundred five million, two hundred seventy-two thousand, nine hundred nine".