161052509 has 16 divisors (see below), whose sum is σ = 178702848. Its totient is φ = 144367872.

The previous prime is 161052499. The next prime is 161052511. The reversal of 161052509 is 905250161.

It is not a de Polignac number, because 161052509 - 2¹² = 161048413 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161052559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107564 + ... + 109050.

It is an arithmetic number, because the mean of its divisors is an integer number (11168928).

Almost surely, 2^161052509 is an apocalyptic number.

It is an amenable number.

161052509 is a deficient number, since it is larger than the sum of its proper divisors (17650339).

161052509 is a wasteful number, since it uses less digits than its factorization.

161052509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 161052509 is about 12690.6465162339. The cubic root of 161052509 is about 544.0713180089.

The spelling of 161052509 in words is "one hundred sixty-one million, fifty-two thousand, five hundred nine".