1320181 has 2 divisors, whose sum is σ = 1320182. Its totient is φ = 1320180.

The previous prime is 1320173. The next prime is 1320191. The reversal of 1320181 is 1810231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1285956 + 34225 = 1134^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320181 - 2³ = 1320173 is a prime.

It is a super-2 number, since 2×1320181² = 3485755745522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660090 + 660091.

It is an arithmetic number, because the mean of its divisors is an integer number (660091).

2^1320181 is an apocalyptic number.

It is an amenable number.

1320181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320181 is an equidigital number, since it uses as much as digits as its factorization.

1320181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1320181 is about 1148.9912967468. The cubic root of 1320181 is about 109.7011447083.

The spelling of 1320181 in words is "one million, three hundred twenty thousand, one hundred eighty-one".