111661311 has 16 divisors (see below), whose sum is σ = 152764416. Its totient is φ = 72524736.

The previous prime is 111661279. The next prime is 111661337. The reversal of 111661311 is 113166111.

It is not a de Polignac number, because 111661311 - 2⁵ = 111661279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111661351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15106 + ... + 21248.

It is an arithmetic number, because the mean of its divisors is an integer number (9547776).

Almost surely, 2^111661311 is an apocalyptic number.

111661311 is a deficient number, since it is larger than the sum of its proper divisors (41103105).

111661311 is an equidigital number, since it uses as much as digits as its factorization.

111661311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6302.

The product of its digits is 108, while the sum is 21.

The square root of 111661311 is about 10566.9915775494. The cubic root of 111661311 is about 481.5420761208.

The spelling of 111661311 in words is "one hundred eleven million, six hundred sixty-one thousand, three hundred eleven".