161919530 has 16 divisors (see below), whose sum is σ = 291621600. Its totient is φ = 64730832.

The previous prime is 161919497. The next prime is 161919533. The reversal of 161919530 is 35919161.

161919530 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161919533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20021 + ... + 26919.

It is an arithmetic number, because the mean of its divisors is an integer number (18226350).

Almost surely, 2^161919530 is an apocalyptic number.

161919530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161919530 is a deficient number, since it is larger than the sum of its proper divisors (129702070).

161919530 is a wasteful number, since it uses less digits than its factorization.

161919530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9253.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 161919530 is about 12724.7605085518. The cubic root of 161919530 is about 545.0459013608.

The spelling of 161919530 in words is "one hundred sixty-one million, nine hundred nineteen thousand, five hundred thirty".