111815489409 has 16 divisors (see below), whose sum is σ = 162754970112. Its totient is φ = 67866933888.

The previous prime is 111815489407. The next prime is 111815489441. The reversal of 111815489409 is 904984518111.

It is not a de Polignac number, because 111815489409 - 2¹ = 111815489407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111815489407) 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 15 ways as a sum of consecutive naturals, for example, 19634577 + ... + 19640270.

It is an arithmetic number, because the mean of its divisors is an integer number (10172185632).

Almost surely, 2^111815489409 is an apocalyptic number.

It is an amenable number.

111815489409 is a deficient number, since it is larger than the sum of its proper divisors (50939480703).

111815489409 is a wasteful number, since it uses less digits than its factorization.

111815489409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39274936.

The product of its (nonzero) digits is 414720, while the sum is 51.

The spelling of 111815489409 in words is "one hundred eleven billion, eight hundred fifteen million, four hundred eighty-nine thousand, four hundred nine".