161122111 has 2 divisors, whose sum is σ = 161122112. Its totient is φ = 161122110.

The previous prime is 161122081. The next prime is 161122127. The reversal of 161122111 is 111221161.

It is an a-pointer prime, because the next prime (161122127) can be obtained adding 161122111 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161122111 - 2⁵ = 161122079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161152111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80561055 + 80561056.

It is an arithmetic number, because the mean of its divisors is an integer number (80561056).

Almost surely, 2^161122111 is an apocalyptic number.

161122111 is a deficient number, since it is larger than the sum of its proper divisors (1).

161122111 is an equidigital number, since it uses as much as digits as its factorization.

161122111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 16.

The square root of 161122111 is about 12693.3884758956. The cubic root of 161122111 is about 544.1496837507.

Adding to 161122111 its reverse (111221161), we get a palindrome (272343272).

The spelling of 161122111 in words is "one hundred sixty-one million, one hundred twenty-two thousand, one hundred eleven".