12312081 has 14 divisors (see below), whose sum is σ = 18460770. Its totient is φ = 8207568.

The previous prime is 12312067. The next prime is 12312089. The reversal of 12312081 is 18021321.

It can be written as a sum of positive squares in only one way, i.e., 7290000 + 5022081 = 2700^2 + 2241^2 .

It is not a de Polignac number, because 12312081 - 2⁶ = 12312017 is a prime.

It is a super-2 number, since 2×12312081² = 303174677101122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12312089) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 7716 + ... + 9173.

Almost surely, 2^12312081 is an apocalyptic number.

It is an amenable number.

12312081 is a deficient number, since it is larger than the sum of its proper divisors (6148689).

12312081 is an frugal number, since it uses more digits than its factorization.

12312081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16907 (or 16892 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 12312081 is about 3508.8575063687. The cubic root of 12312081 is about 230.9105742572.

It can be divided in two parts, 123120 and 81, that added together give a square (123201 = 351²).

The spelling of 12312081 in words is "twelve million, three hundred twelve thousand, eighty-one".