1099181 has 2 divisors, whose sum is σ = 1099182. Its totient is φ = 1099180.

The previous prime is 1099177. The next prime is 1099199. The reversal of 1099181 is 1819901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 697225 + 401956 = 835^2 + 634^2 .

It is a cyclic number.

It is not a de Polignac number, because 1099181 - 2² = 1099177 is a prime.

It is a super-2 number, since 2×1099181² = 2416397741522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1099121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549590 + 549591.

It is an arithmetic number, because the mean of its divisors is an integer number (549591).

2^1099181 is an apocalyptic number.

It is an amenable number.

1099181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099181 is an equidigital number, since it uses as much as digits as its factorization.

1099181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 1099181 is about 1048.4183325372. The cubic root of 1099181 is about 103.2023858692.

The spelling of 1099181 in words is "one million, ninety-nine thousand, one hundred eighty-one".