161522000 has 40 divisors (see below), whose sum is σ = 390565032. Its totient is φ = 64608000.

The previous prime is 161521979. The next prime is 161522003. The reversal of 161522000 is 225161.

It can be written as a sum of positive squares in 4 ways, for example, as 19149376 + 142372624 = 4376^2 + 11932^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 161522000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161522003) 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, 38381 + ... + 42380.

Almost surely, 2^161522000 is an apocalyptic number.

161522000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161522000 is an abundant number, since it is smaller than the sum of its proper divisors (229043032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161522000 is an equidigital number, since it uses as much as digits as its factorization.

161522000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80784 (or 80768 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 161522000 is about 12709.1305760858. The cubic root of 161522000 is about 544.5994869037.

Adding to 161522000 its reverse (225161), we get a palindrome (161747161).

The spelling of 161522000 in words is "one hundred sixty-one million, five hundred twenty-two thousand".