111397781 has 8 divisors (see below), whose sum is σ = 123190464. Its totient is φ = 99882720.

The previous prime is 111397777. The next prime is 111397813. The reversal of 111397781 is 187793111.

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 111397781 - 2² = 111397777 is a prime.

It is a super-2 number, since 2×111397781² = 24818931223447922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111397711) 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, 68561 + ... + 70166.

It is an arithmetic number, because the mean of its divisors is an integer number (15398808).

Almost surely, 2^111397781 is an apocalyptic number.

111397781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111397781 is a deficient number, since it is larger than the sum of its proper divisors (11792683).

111397781 is a wasteful number, since it uses less digits than its factorization.

111397781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138811.

The product of its digits is 10584, while the sum is 38.

The square root of 111397781 is about 10554.5147211987. The cubic root of 111397781 is about 481.1629512314.

The spelling of 111397781 in words is "one hundred eleven million, three hundred ninety-seven thousand, seven hundred eighty-one".