11172390085 has 4 divisors (see below), whose sum is σ = 13406868108. Its totient is φ = 8937912064.

The previous prime is 11172390083. The next prime is 11172390113. The reversal of 11172390085 is 58009327111.

11172390085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58009327111 = 23 ⋅2522144657.

It can be written as a sum of positive squares in 2 ways, for example, as 7625830276 + 3546559809 = 87326^2 + 59553^2 .

It is a cyclic number.

It is not a de Polignac number, because 11172390085 - 2¹ = 11172390083 is a prime.

It is a super-2 number, since 2×11172390085² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11172390083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1117239004 + ... + 1117239013.

It is an arithmetic number, because the mean of its divisors is an integer number (3351717027).

Almost surely, 2^11172390085 is an apocalyptic number.

It is an amenable number.

11172390085 is a deficient number, since it is larger than the sum of its proper divisors (2234478023).

11172390085 is an equidigital number, since it uses as much as digits as its factorization.

11172390085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234478022.

The product of its (nonzero) digits is 15120, while the sum is 37.

The spelling of 11172390085 in words is "eleven billion, one hundred seventy-two million, three hundred ninety thousand, eighty-five".