161005145 has 32 divisors (see below), whose sum is σ = 233798400. Its totient is φ = 103977216.

The previous prime is 161005133. The next prime is 161005153. The reversal of 161005145 is 541500161.

It is not a de Polignac number, because 161005145 - 2²⁰ = 159956569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161005145.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130391 + ... + 131619.

It is an arithmetic number, because the mean of its divisors is an integer number (7306200).

Almost surely, 2^161005145 is an apocalyptic number.

It is an amenable number.

161005145 is a deficient number, since it is larger than the sum of its proper divisors (72793255).

161005145 is a wasteful number, since it uses less digits than its factorization.

161005145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 161005145 is about 12688.7802802318. The cubic root of 161005145 is about 544.0179773921.

The spelling of 161005145 in words is "one hundred sixty-one million, five thousand, one hundred forty-five".