161005111 has 8 divisors (see below), whose sum is σ = 162610448. Its totient is φ = 159408000.

The previous prime is 161005049. The next prime is 161005133. The reversal of 161005111 is 111500161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161005111 - 2⁷ = 161004983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161005511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41776 + ... + 45466.

It is an arithmetic number, because the mean of its divisors is an integer number (20326306).

Almost surely, 2^161005111 is an apocalyptic number.

161005111 is a deficient number, since it is larger than the sum of its proper divisors (1605337).

161005111 is a wasteful number, since it uses less digits than its factorization.

161005111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113.

The product of its (nonzero) digits is 30, while the sum is 16.

The square root of 161005111 is about 12688.7789404655. The cubic root of 161005111 is about 544.0179390981.

Adding to 161005111 its reverse (111500161), we get a palindrome (272505272).

The spelling of 161005111 in words is "one hundred sixty-one million, five thousand, one hundred eleven".