161521022 has 8 divisors (see below), whose sum is σ = 260918616. Its totient is φ = 74548152.

The previous prime is 161521007. The next prime is 161521043. The reversal of 161521022 is 220125161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 161520985 and 161521003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3106148 + ... + 3106199.

It is an arithmetic number, because the mean of its divisors is an integer number (32614827).

Almost surely, 2^161521022 is an apocalyptic number.

161521022 is a deficient number, since it is larger than the sum of its proper divisors (99397594).

161521022 is a wasteful number, since it uses less digits than its factorization.

161521022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6212362.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 161521022 is about 12709.0920997528. The cubic root of 161521022 is about 544.5983877358.

Adding to 161521022 its reverse (220125161), we get a palindrome (381646183).

The spelling of 161521022 in words is "one hundred sixty-one million, five hundred twenty-one thousand, twenty-two".