161489100 has 36 divisors (see below), whose sum is σ = 467242664. Its totient is φ = 43063680.

The previous prime is 161489087. The next prime is 161489129. The reversal of 161489100 is 1984161.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268849 + ... + 269448.

Almost surely, 2^161489100 is an apocalyptic number.

161489100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161489100 is an abundant number, since it is smaller than the sum of its proper divisors (305753564).

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

161489100 is a wasteful number, since it uses less digits than its factorization.

161489100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538314 (or 538307 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 161489100 is about 12707.8361651384. The cubic root of 161489100 is about 544.5625083708.

The spelling of 161489100 in words is "one hundred sixty-one million, four hundred eighty-nine thousand, one hundred".