161101020 has 24 divisors (see below), whose sum is σ = 451083024. Its totient is φ = 42960256.

The previous prime is 161101001. The next prime is 161101021. The reversal of 161101020 is 20101161.

It is a happy number.

161101020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 161100987 and 161101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161101021) 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, 1342449 + ... + 1342568.

It is an arithmetic number, because the mean of its divisors is an integer number (18795126).

Almost surely, 2^161101020 is an apocalyptic number.

161101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161101020 is an abundant number, since it is smaller than the sum of its proper divisors (289982004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161101020 is a wasteful number, since it uses less digits than its factorization.

161101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2685029 (or 2685027 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 161101020 is about 12692.5576618741. The cubic root of 161101020 is about 544.1259395198.

Adding to 161101020 its reverse (20101161), we get a palindrome (181202181).

The spelling of 161101020 in words is "one hundred sixty-one million, one hundred one thousand, twenty".