161970804 has 18 divisors (see below), whose sum is σ = 409426290. Its totient is φ = 53990256.

The previous prime is 161970803. The next prime is 161970841. The reversal of 161970804 is 408079161.

It can be written as a sum of positive squares in only one way, i.e., 160275600 + 1695204 = 12660^2 + 1302^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4499189 = 161970804 / (1 + 6 + 1 + 9 + 7 + 0 + 8 + 0 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161970803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2249559 + ... + 2249630.

It is an arithmetic number, because the mean of its divisors is an integer number (22745905).

Almost surely, 2^161970804 is an apocalyptic number.

It is an amenable number.

161970804 is an abundant number, since it is smaller than the sum of its proper divisors (247455486).

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

161970804 is a wasteful number, since it uses less digits than its factorization.

161970804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4499199 (or 4499194 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 161970804 is about 12726.7750824787. The cubic root of 161970804 is about 545.1034273310.

The spelling of 161970804 in words is "one hundred sixty-one million, nine hundred seventy thousand, eight hundred four".