161173100 has 36 divisors (see below), whose sum is σ = 381543288. Its totient is φ = 58608000.

The previous prime is 161173087. The next prime is 161173109. The reversal of 161173100 is 1371161.

161173100 = 4485² + 4486² + ... + 4492².

It is a super-2 number, since 2×161173100² = 51953536327220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (161173109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72161 + ... + 74360.

Almost surely, 2^161173100 is an apocalyptic number.

161173100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161173100 is an abundant number, since it is smaller than the sum of its proper divisors (220370188).

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

161173100 is a wasteful number, since it uses less digits than its factorization.

161173100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146546 (or 146539 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 161173100 is about 12695.3968035662. The cubic root of 161173100 is about 544.2070785671.

The spelling of 161173100 in words is "one hundred sixty-one million, one hundred seventy-three thousand, one hundred".