161642459 has 16 divisors (see below), whose sum is σ = 188504064. Its totient is φ = 137121600.

The previous prime is 161642441. The next prime is 161642471. The reversal of 161642459 is 954246161.

It is not a de Polignac number, because 161642459 - 2¹⁶ = 161576923 is a prime.

It is a super-2 number, since 2×161642459² = 52256569103133362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161642419) 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, 2582 + ... + 18164.

It is an arithmetic number, because the mean of its divisors is an integer number (11781504).

Almost surely, 2^161642459 is an apocalyptic number.

161642459 is a deficient number, since it is larger than the sum of its proper divisors (26861605).

161642459 is a wasteful number, since it uses less digits than its factorization.

161642459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15658.

The product of its digits is 51840, while the sum is 38.

The square root of 161642459 is about 12713.8687660366. The cubic root of 161642459 is about 544.7348360785.

The spelling of 161642459 in words is "one hundred sixty-one million, six hundred forty-two thousand, four hundred fifty-nine".