161240804 has 6 divisors (see below), whose sum is σ = 282171414. Its totient is φ = 80620400.

The previous prime is 161240791. The next prime is 161240861. The reversal of 161240804 is 408042161.

161240804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 161239204 + 1600 = 12698^2 + 40^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20155097 + ... + 20155104.

It is an arithmetic number, because the mean of its divisors is an integer number (47028569).

Almost surely, 2^161240804 is an apocalyptic number.

It is an amenable number.

161240804 is a deficient number, since it is larger than the sum of its proper divisors (120930610).

161240804 is a wasteful number, since it uses less digits than its factorization.

161240804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40310205 (or 40310203 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 161240804 is about 12698.0630018913. The cubic root of 161240804 is about 544.2832696066.

Adding to 161240804 its reverse (408042161), we get a palindrome (569282965).

The spelling of 161240804 in words is "one hundred sixty-one million, two hundred forty thousand, eight hundred four".