111379581 has 6 divisors (see below), whose sum is σ = 160881630. Its totient is φ = 74253048.

The previous prime is 111379573. The next prime is 111379591. The reversal of 111379581 is 185973111.

111379581 is a `hidden beast` number, since 1 + 1 + 1 + 3 + 79 + 581 = 666.

It can be written as a sum of positive squares in only one way, i.e., 83722500 + 27657081 = 9150^2 + 5259^2 .

It is not a de Polignac number, because 111379581 - 2³ = 111379573 is a prime.

It is a super-2 number, since 2×111379581² = 24810822127471122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111379591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6187746 + ... + 6187763.

It is an arithmetic number, because the mean of its divisors is an integer number (26813605).

Almost surely, 2^111379581 is an apocalyptic number.

It is an amenable number.

111379581 is a deficient number, since it is larger than the sum of its proper divisors (49502049).

111379581 is a wasteful number, since it uses less digits than its factorization.

111379581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12375515 (or 12375512 counting only the distinct ones).

The product of its digits is 7560, while the sum is 36.

The square root of 111379581 is about 10553.6524957002. The cubic root of 111379581 is about 481.1367459139.

The spelling of 111379581 in words is "one hundred eleven million, three hundred seventy-nine thousand, five hundred eighty-one".