161545287 has 4 divisors (see below), whose sum is σ = 215393720. Its totient is φ = 107696856.

The previous prime is 161545273. The next prime is 161545297. The reversal of 161545287 is 782545161.

161545287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782545161 = 3 ⋅260848387.

It is not a de Polignac number, because 161545287 - 2¹⁴ = 161528903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161545297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26924212 + ... + 26924217.

It is an arithmetic number, because the mean of its divisors is an integer number (53848430).

Almost surely, 2^161545287 is an apocalyptic number.

161545287 is a deficient number, since it is larger than the sum of its proper divisors (53848433).

161545287 is an equidigital number, since it uses as much as digits as its factorization.

161545287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53848432.

The product of its digits is 67200, while the sum is 39.

The square root of 161545287 is about 12710.0466954296. The cubic root of 161545287 is about 544.6256577015.

The spelling of 161545287 in words is "one hundred sixty-one million, five hundred forty-five thousand, two hundred eighty-seven".