1612181 has 2 divisors, whose sum is σ = 1612182. Its totient is φ = 1612180.

The previous prime is 1612157. The next prime is 1612183. The reversal of 1612181 is 1812161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1500625 + 111556 = 1225^2 + 334^2 .

It is a cyclic number.

It is not a de Polignac number, because 1612181 - 2¹⁰ = 1611157 is a prime.

It is a super-2 number, since 2×1612181² = 5198255153522, which contains 22 as substring.

Together with 1612183, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1612183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806090 + 806091.

It is an arithmetic number, because the mean of its divisors is an integer number (806091).

2^1612181 is an apocalyptic number.

It is an amenable number.

1612181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1612181 is an equidigital number, since it uses as much as digits as its factorization.

1612181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 20.

The square root of 1612181 is about 1269.7168975799. The cubic root of 1612181 is about 117.2567716427.

Subtracting from 1612181 its sum of digits (20), we obtain a palindrome (1612161).

The spelling of 1612181 in words is "one million, six hundred twelve thousand, one hundred eighty-one".