111827561 has 2 divisors, whose sum is σ = 111827562. Its totient is φ = 111827560.

The previous prime is 111827557. The next prime is 111827647. The reversal of 111827561 is 165728111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89208025 + 22619536 = 9445^2 + 4756^2 .

It is an emirp because it is prime and its reverse (165728111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111827561 - 2² = 111827557 is a prime.

It is not a weakly prime, because it can be changed into another prime (111827501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55913780 + 55913781.

It is an arithmetic number, because the mean of its divisors is an integer number (55913781).

Almost surely, 2^111827561 is an apocalyptic number.

It is an amenable number.

111827561 is a deficient number, since it is larger than the sum of its proper divisors (1).

111827561 is an equidigital number, since it uses as much as digits as its factorization.

111827561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 32.

The square root of 111827561 is about 10574.8551290313. The cubic root of 111827561 is about 481.7809433134.

The spelling of 111827561 in words is "one hundred eleven million, eight hundred twenty-seven thousand, five hundred sixty-one".