162639009 has 45 divisors (see below), whose sum is σ = 265516713. Its totient is φ = 99167328.

The previous prime is 162638999. The next prime is 162639067. The reversal of 162639009 is 900936261.

The square root of 162639009 is 12753.

It is a perfect power (a square), and thus also a powerful number.

162639009 is a `hidden beast` number, since 16 + 2 + 639 + 0 + 0 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5688225 + 156950784 = 2385^2 + 12528^2 .

It is not a de Polignac number, because 162639009 - 2¹¹ = 162636961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (162639079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1492047 + ... + 1492155.

Almost surely, 2^162639009 is an apocalyptic number.

162639009 is the 12753-rd square number.

162639009 is the 6377-th centered octagonal number.

It is an amenable number.

162639009 is a deficient number, since it is larger than the sum of its proper divisors (102877704).

162639009 is an equidigital number, since it uses as much as digits as its factorization.

162639009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The cubic root of 162639009 is about 545.8520007031.

Multiplying 162639009 by its sum of digits (36), we get a square (5855004324 = 76518²).

The spelling of 162639009 in words is "one hundred sixty-two million, six hundred thirty-nine thousand, nine".