111551261 has 8 divisors (see below), whose sum is σ = 118634880. Its totient is φ = 104588928.

The previous prime is 111551233. The next prime is 111551267. The reversal of 111551261 is 162155111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111551261 - 2¹⁰ = 111550237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111551267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28421 + ... + 32106.

It is an arithmetic number, because the mean of its divisors is an integer number (14829360).

Almost surely, 2^111551261 is an apocalyptic number.

It is an amenable number.

111551261 is a deficient number, since it is larger than the sum of its proper divisors (7083619).

111551261 is an equidigital number, since it uses as much as digits as its factorization.

111551261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60643.

The product of its digits is 300, while the sum is 23.

The square root of 111551261 is about 10561.7830407559. The cubic root of 111551261 is about 481.3838263678.

The spelling of 111551261 in words is "one hundred eleven million, five hundred fifty-one thousand, two hundred sixty-one".