111557121 has 16 divisors (see below), whose sum is σ = 160896960. Its totient is φ = 68345280.

The previous prime is 111557119. The next prime is 111557123. The reversal of 111557121 is 121755111.

It is an interprime number because it is at equal distance from previous prime (111557119) and next prime (111557123).

It is not a de Polignac number, because 111557121 - 2¹ = 111557119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111557091 and 111557100.

It is not an unprimeable number, because it can be changed into a prime (111557123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2686 + ... + 15176.

It is an arithmetic number, because the mean of its divisors is an integer number (10056060).

Almost surely, 2^111557121 is an apocalyptic number.

It is an amenable number.

111557121 is a deficient number, since it is larger than the sum of its proper divisors (49339839).

111557121 is a wasteful number, since it uses less digits than its factorization.

111557121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12736.

The product of its digits is 350, while the sum is 24.

The square root of 111557121 is about 10562.0604523928. The cubic root of 111557121 is about 481.3922555563.

The spelling of 111557121 in words is "one hundred eleven million, five hundred fifty-seven thousand, one hundred twenty-one".