161423100 has 108 divisors (see below), whose sum is σ = 513715384. Its totient is φ = 42387840.

The previous prime is 161423083. The next prime is 161423111. The reversal of 161423100 is 1324161.

It is a happy number.

It is a super-2 number, since 2×161423100² = 52114834427220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 58962 + ... + 61638.

Almost surely, 2^161423100 is an apocalyptic number.

161423100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161423100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256857692).

161423100 is an abundant number, since it is smaller than the sum of its proper divisors (352292284).

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

161423100 is a wasteful number, since it uses less digits than its factorization.

161423100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764 (or 2754 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 161423100 is about 12705.2390768533. The cubic root of 161423100 is about 544.4883113651.

Adding to 161423100 its reverse (1324161), we get a palindrome (162747261).

The spelling of 161423100 in words is "one hundred sixty-one million, four hundred twenty-three thousand, one hundred".