1865161 has 2 divisors, whose sum is σ = 1865162. Its totient is φ = 1865160.

The previous prime is 1865159. The next prime is 1865179. The reversal of 1865161 is 1615681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1863225 + 1936 = 1365^2 + 44^2 .

It is a cyclic number.

It is not a de Polignac number, because 1865161 - 2¹ = 1865159 is a prime.

Together with 1865159, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1865141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932580 + 932581.

It is an arithmetic number, because the mean of its divisors is an integer number (932581).

2^1865161 is an apocalyptic number.

It is an amenable number.

1865161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865161 is an equidigital number, since it uses as much as digits as its factorization.

1865161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 28.

The square root of 1865161 is about 1365.7089733907. The cubic root of 1865161 is about 123.0945359109.

The spelling of 1865161 in words is "one million, eight hundred sixty-five thousand, one hundred sixty-one".