111771993 has 8 divisors (see below), whose sum is σ = 149568448. Its totient is φ = 74245104.

The previous prime is 111771983. The next prime is 111772009. The reversal of 111771993 is 399177111.

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

It is not a de Polignac number, because 111771993 - 2⁴ = 111771977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111771943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66421 + ... + 68082.

It is an arithmetic number, because the mean of its divisors is an integer number (18696056).

Almost surely, 2^111771993 is an apocalyptic number.

It is an amenable number.

111771993 is a deficient number, since it is larger than the sum of its proper divisors (37796455).

111771993 is a wasteful number, since it uses less digits than its factorization.

111771993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134783.

The product of its digits is 11907, while the sum is 39.

The square root of 111771993 is about 10572.2274379622. The cubic root of 111771993 is about 481.7011298375.

The spelling of 111771993 in words is "one hundred eleven million, seven hundred seventy-one thousand, nine hundred ninety-three".