161711011 has 32 divisors (see below), whose sum is σ = 208406016. Its totient is φ = 121824000.

The previous prime is 161710993. The next prime is 161711057. The reversal of 161711011 is 110117161.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 161711011 - 2²⁷ = 27493283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161711011.

It is not an unprimeable number, because it can be changed into a prime (161711111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 571276 + ... + 571558.

It is an arithmetic number, because the mean of its divisors is an integer number (6512688).

Almost surely, 2^161711011 is an apocalyptic number.

161711011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161711011 is a deficient number, since it is larger than the sum of its proper divisors (46695005).

161711011 is a wasteful number, since it uses less digits than its factorization.

161711011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523.

The product of its (nonzero) digits is 42, while the sum is 19.

The square root of 161711011 is about 12716.5644338398. The cubic root of 161711011 is about 544.8118319062.

Adding to 161711011 its reverse (110117161), we get a palindrome (271828172).

The spelling of 161711011 in words is "one hundred sixty-one million, seven hundred eleven thousand, eleven".