161212328 has 16 divisors (see below), whose sum is σ = 309646260. Its totient is φ = 78640000.

The previous prime is 161212327. The next prime is 161212349. The reversal of 161212328 is 823212161.

It can be written as a sum of positive squares in 2 ways, for example, as 159719044 + 1493284 = 12638^2 + 1222^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161212297 and 161212306.

It is not an unprimeable number, because it can be changed into a prime (161212327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245423 + ... + 246078.

Almost surely, 2^161212328 is an apocalyptic number.

It is an amenable number.

161212328 is a deficient number, since it is larger than the sum of its proper divisors (148433932).

161212328 is a wasteful number, since it uses less digits than its factorization.

161212328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491548 (or 491544 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 161212328 is about 12696.9416790029. The cubic root of 161212328 is about 544.2512265949.

Adding to 161212328 its reverse (823212161), we get a palindrome (984424489).

The spelling of 161212328 in words is "one hundred sixty-one million, two hundred twelve thousand, three hundred twenty-eight".