161161011 has 24 divisors (see below), whose sum is σ = 260820144. Its totient is φ = 95031360.

The previous prime is 161160997. The next prime is 161161043. The reversal of 161161011 is 110161161.

It is not a de Polignac number, because 161161011 - 2²¹ = 159063859 is a prime.

It is a super-3 number, since 3×161161011³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (161161061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18336 + ... + 25661.

It is an arithmetic number, because the mean of its divisors is an integer number (10867506).

Almost surely, 2^161161011 is an apocalyptic number.

161161011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161161011 is a deficient number, since it is larger than the sum of its proper divisors (99659133).

161161011 is a wasteful number, since it uses less digits than its factorization.

161161011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44051 (or 44048 counting only the distinct ones).

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

The square root of 161161011 is about 12694.9206771842. The cubic root of 161161011 is about 544.1934719047.

The spelling of 161161011 in words is "one hundred sixty-one million, one hundred sixty-one thousand, eleven".