161501706 has 48 divisors (see below), whose sum is σ = 365306760. Its totient is φ = 51517440.

The previous prime is 161501701. The next prime is 161501713. The reversal of 161501706 is 607105161.

It can be written as a sum of positive squares in 4 ways, for example, as 119705481 + 41796225 = 10941^2 + 6465^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161501706.

It is not an unprimeable number, because it can be changed into a prime (161501701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37050 + ... + 41178.

Almost surely, 2^161501706 is an apocalyptic number.

161501706 is an abundant number, since it is smaller than the sum of its proper divisors (203805054).

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

161501706 is a wasteful number, since it uses less digits than its factorization.

161501706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4231 (or 4228 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 161501706 is about 12708.3321486338. The cubic root of 161501706 is about 544.5766776994.

Adding to 161501706 its reverse (607105161), we get a palindrome (768606867).

The spelling of 161501706 in words is "one hundred sixty-one million, five hundred one thousand, seven hundred six".