161545090 has 32 divisors (see below), whose sum is σ = 332763264. Its totient is φ = 55313280.

The previous prime is 161545081. The next prime is 161545091. The reversal of 161545090 is 90545161.

161545090 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161545090² = 52193632206216200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161545091) 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 15 ways as a sum of consecutive naturals, for example, 91597 + ... + 93343.

It is an arithmetic number, because the mean of its divisors is an integer number (10398852).

Almost surely, 2^161545090 is an apocalyptic number.

161545090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161545090 is an abundant number, since it is smaller than the sum of its proper divisors (171218174).

161545090 is a wasteful number, since it uses less digits than its factorization.

161545090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 161545090 is about 12710.0389456524. The cubic root of 161545090 is about 544.6254363161.

The spelling of 161545090 in words is "one hundred sixty-one million, five hundred forty-five thousand, ninety".