161118331 has 8 divisors (see below), whose sum is σ = 177506928. Its totient is φ = 145020000.

The previous prime is 161118329. The next prime is 161118337. The reversal of 161118331 is 133811161.

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 161118331 - 2¹ = 161118329 is a prime.

It is a super-2 number, since 2×161118331² = 51918233168451122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161118296 and 161118305.

It is not an unprimeable number, because it can be changed into a prime (161118337) 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, 71400 + ... + 73621.

It is an arithmetic number, because the mean of its divisors is an integer number (22188366).

Almost surely, 2^161118331 is an apocalyptic number.

161118331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161118331 is a deficient number, since it is larger than the sum of its proper divisors (16388597).

161118331 is a wasteful number, since it uses less digits than its factorization.

161118331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145133.

The product of its digits is 432, while the sum is 25.

The square root of 161118331 is about 12693.2395786103. The cubic root of 161118331 is about 544.1454283821.

Adding to 161118331 its reverse (133811161), we get a palindrome (294929492).

It can be divided in two parts, 16111 and 8331, that added together give a palindrome (24442).

The spelling of 161118331 in words is "one hundred sixty-one million, one hundred eighteen thousand, three hundred thirty-one".