111751809849 has 9 divisors (see below), whose sum is σ = 161420729509. Its totient is φ = 74500537980.

The previous prime is 111751809787. The next prime is 111751809893. The reversal of 111751809849 is 948908157111.

The square root of 111751809849 is 334293.

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

111751809849 is a `hidden beast` number, since 1 + 117 + 518 + 0 + 9 + 8 + 4 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 111751809849 - 2²³ = 111743421241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111751809795 and 111751809804.

It is not an unprimeable number, because it can be changed into a prime (111751809899) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 947164 + ... + 1058594.

Almost surely, 2^111751809849 is an apocalyptic number.

111751809849 is the 334293-rd square number.

111751809849 is the 167147-th centered octagonal number.

It is an amenable number.

111751809849 is a deficient number, since it is larger than the sum of its proper divisors (49668919660).

111751809849 is an frugal number, since it uses more digits than its factorization.

111751809849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222868 (or 111434 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 54.

It can be divided in two parts, 111751 and 809849, that added together give a square (921600 = 960²).

The spelling of 111751809849 in words is "one hundred eleven billion, seven hundred fifty-one million, eight hundred nine thousand, eight hundred forty-nine".