12311899681 has 27 divisors (see below), whose sum is σ = 13422080217. Its totient is φ = 11291187840.

The previous prime is 12311899679. The next prime is 12311899693. The reversal of 12311899681 is 18699811321.

The square root of 12311899681 is 110959.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1136027025 + 11175872656 = 33705^2 + 105716^2 .

It is not a de Polignac number, because 12311899681 - 2¹ = 12311899679 is a prime.

It is a super-2 number, since 2×12311899681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12311899181) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 115064430 + ... + 115064536.

Almost surely, 2^12311899681 is an apocalyptic number.

12311899681 is the 110959-th square number.

12311899681 is the 55480-th centered octagonal number.

It is an amenable number.

12311899681 is a deficient number, since it is larger than the sum of its proper divisors (1110180536).

12311899681 is an frugal number, since it uses more digits than its factorization.

12311899681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370 (or 185 counting only the distinct ones).

The product of its digits is 186624, while the sum is 49.

Multiplying 12311899681 by its sum of digits (49), we get a square (603283084369 = 776713²).

The spelling of 12311899681 in words is "twelve billion, three hundred eleven million, eight hundred ninety-nine thousand, six hundred eighty-one".