161135011 has 4 divisors (see below), whose sum is σ = 161244432. Its totient is φ = 161025592.

The previous prime is 161134979. The next prime is 161135047. The reversal of 161135011 is 110531161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161135011 - 2⁵ = 161134979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161135011.

It is not an unprimeable number, because it can be changed into a prime (161135071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52471 + ... + 55456.

It is an arithmetic number, because the mean of its divisors is an integer number (40311108).

Almost surely, 2^161135011 is an apocalyptic number.

161135011 is a deficient number, since it is larger than the sum of its proper divisors (109421).

161135011 is a wasteful number, since it uses less digits than its factorization.

161135011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109420.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 161135011 is about 12693.8966042740. The cubic root of 161135011 is about 544.1642055390.

Adding to 161135011 its reverse (110531161), we get a palindrome (271666172).

The spelling of 161135011 in words is "one hundred sixty-one million, one hundred thirty-five thousand, eleven".