161290000 has 75 divisors (see below), whose sum is σ = 393598227. Its totient is φ = 64008000.

The previous prime is 161289977. The next prime is 161290009. The reversal of 161290000 is 92161.

The square root of 161290000 is 12700.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12645136 + 148644864 = 3556^2 + 12192^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161290000.

It is not an unprimeable number, because it can be changed into a prime (161290009) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1269937 + ... + 1270063.

Almost surely, 2^161290000 is an apocalyptic number.

161290000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161290000 is the 12700-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161290000

161290000 is an abundant number, since it is smaller than the sum of its proper divisors (232308227).

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

161290000 is an frugal number, since it uses more digits than its factorization.

161290000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

The cubic root of 161290000 is about 544.3386191961.

The spelling of 161290000 in words is "one hundred sixty-one million, two hundred ninety thousand".