161016111 has 6 divisors (see below), whose sum is σ = 232578840. Its totient is φ = 107344068.

The previous prime is 161016109. The next prime is 161016157. The reversal of 161016111 is 111610161.

It is not a de Polignac number, because 161016111 - 2¹ = 161016109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161014111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8945331 + ... + 8945348.

It is an arithmetic number, because the mean of its divisors is an integer number (38763140).

Almost surely, 2^161016111 is an apocalyptic number.

161016111 is a deficient number, since it is larger than the sum of its proper divisors (71562729).

161016111 is a wasteful number, since it uses less digits than its factorization.

161016111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17890685 (or 17890682 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The square root of 161016111 is about 12689.2123869057. The cubic root of 161016111 is about 544.0303280652.

Adding to 161016111 its reverse (111610161), we get a palindrome (272626272).

It can be divided in two parts, 1610161 and 11, that multiplied together give a palindrome (17711771).

The spelling of 161016111 in words is "one hundred sixty-one million, sixteen thousand, one hundred eleven".