2161157 has 2 divisors, whose sum is σ = 2161158. Its totient is φ = 2161156.

The previous prime is 2161141. The next prime is 2161163. The reversal of 2161157 is 7511612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1522756 + 638401 = 1234^2 + 799^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161157 - 2⁴ = 2161141 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080578 + 1080579.

It is an arithmetic number, because the mean of its divisors is an integer number (1080579).

2^2161157 is an apocalyptic number.

It is an amenable number.

2161157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161157 is an equidigital number, since it uses as much as digits as its factorization.

2161157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 420, while the sum is 23.

The square root of 2161157 is about 1470.0874123670. The cubic root of 2161157 is about 129.2891576612.

Adding to 2161157 its reverse (7511612), we get a palindrome (9672769).

The spelling of 2161157 in words is "two million, one hundred sixty-one thousand, one hundred fifty-seven".