161232111 has 6 divisors (see below), whose sum is σ = 232890840. Its totient is φ = 107488068.

The previous prime is 161232101. The next prime is 161232121. The reversal of 161232111 is 111232161.

It is an interprime number because it is at equal distance from previous prime (161232101) and next prime (161232121).

It is not a de Polignac number, because 161232111 - 2¹⁰ = 161231087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161232101) 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, 8957331 + ... + 8957348.

It is an arithmetic number, because the mean of its divisors is an integer number (38815140).

Almost surely, 2^161232111 is an apocalyptic number.

161232111 is a deficient number, since it is larger than the sum of its proper divisors (71658729).

161232111 is a wasteful number, since it uses less digits than its factorization.

161232111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17914685 (or 17914682 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 161232111 is about 12697.7207009762. The cubic root of 161232111 is about 544.2734880885.

Adding to 161232111 its reverse (111232161), we get a palindrome (272464272).

The spelling of 161232111 in words is "one hundred sixty-one million, two hundred thirty-two thousand, one hundred eleven".