18161011 has 6 divisors (see below), whose sum is σ = 19962236. Its totient is φ = 16509900.

The previous prime is 18160999. The next prime is 18161023. The reversal of 18161011 is 11016181.

It is an interprime number because it is at equal distance from previous prime (18160999) and next prime (18161023).

It is not a de Polignac number, because 18161011 - 2¹⁷ = 18029939 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 18161011.

It is not an unprimeable number, because it can be changed into a prime (18161041) 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 5 ways as a sum of consecutive naturals, for example, 74925 + ... + 75166.

Almost surely, 2^18161011 is an apocalyptic number.

18161011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18161011 is a deficient number, since it is larger than the sum of its proper divisors (1801225).

18161011 is a wasteful number, since it uses less digits than its factorization.

18161011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150113 (or 150102 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 19.

The square root of 18161011 is about 4261.5737703341. The cubic root of 18161011 is about 262.8532435538.

Adding to 18161011 its reverse (11016181), we get a palindrome (29177192).

The spelling of 18161011 in words is "eighteen million, one hundred sixty-one thousand, eleven".