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111661 = 1110151
BaseRepresentation
bin11011010000101101
312200011121
4123100231
512033121
62220541
7643354
oct332055
9180147
10111661
1176990
1254751
133ba94
142c99b
1523141
hex1b42d

111661 has 4 divisors (see below), whose sum is σ = 121824. Its totient is φ = 101500.

The previous prime is 111659. The next prime is 111667. The reversal of 111661 is 166111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166111 = 1115101.

It is a cyclic number.

It is not a de Polignac number, because 111661 - 21 = 111659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5065 + ... + 5086.

It is an arithmetic number, because the mean of its divisors is an integer number (30456).

2111661 is an apocalyptic number.

111661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111661 is a deficient number, since it is larger than the sum of its proper divisors (10163).

111661 is a wasteful number, since it uses less digits than its factorization.

111661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10162.

The product of its digits is 36, while the sum is 16.

The square root of 111661 is about 334.1571486591. The cubic root of 111661 is about 48.1541629055.

Adding to 111661 its reverse (166111), we get a palindrome (277772).

The spelling of 111661 in words is "one hundred eleven thousand, six hundred sixty-one".

Divisors: 1 11 10151 111661