161145320 has 48 divisors (see below), whose sum is σ = 421778340. Its totient is φ = 55249152.

The previous prime is 161145319. The next prime is 161145331. The reversal of 161145320 is 23541161.

161145320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 141943396 + 19201924 = 11914^2 + 4382^2 .

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, 39149 + ... + 43068.

Almost surely, 2^161145320 is an apocalyptic number.

161145320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161145320 is an abundant number, since it is smaller than the sum of its proper divisors (260633020).

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

161145320 is a wasteful number, since it uses less digits than its factorization.

161145320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82242 (or 82231 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 161145320 is about 12694.3026590672. The cubic root of 161145320 is about 544.1758100297.

Adding to 161145320 its reverse (23541161), we get a palindrome (184686481).

The spelling of 161145320 in words is "one hundred sixty-one million, one hundred forty-five thousand, three hundred twenty".