161020522 has 16 divisors (see below), whose sum is σ = 267141672. Its totient is φ = 72308160.

The previous prime is 161020507. The next prime is 161020529. The reversal of 161020522 is 225020161.

It can be written as a sum of positive squares in 4 ways, for example, as 161010721 + 9801 = 12689^2 + 99^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161020522.

It is not an unprimeable number, because it can be changed into a prime (161020529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82729 + ... + 84652.

Almost surely, 2^161020522 is an apocalyptic number.

161020522 is a deficient number, since it is larger than the sum of its proper divisors (106121150).

161020522 is a wasteful number, since it uses less digits than its factorization.

161020522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167433.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 161020522 is about 12689.3861947692. The cubic root of 161020522 is about 544.0352958825.

Adding to 161020522 its reverse (225020161), we get a palindrome (386040683).

The spelling of 161020522 in words is "one hundred sixty-one million, twenty thousand, five hundred twenty-two".