161920827 has 12 divisors (see below), whose sum is σ = 234867360. Its totient is φ = 107494128.

The previous prime is 161920813. The next prime is 161920873. The reversal of 161920827 is 728029161.

It is not a de Polignac number, because 161920827 - 2⁶ = 161920763 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161920791 and 161920800.

It is not an unprimeable number, because it can be changed into a prime (161920807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35488 + ... + 39789.

It is an arithmetic number, because the mean of its divisors is an integer number (19572280).

Almost surely, 2^161920827 is an apocalyptic number.

161920827 is a deficient number, since it is larger than the sum of its proper divisors (72946533).

161920827 is a wasteful number, since it uses less digits than its factorization.

161920827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75522 (or 75519 counting only the distinct ones).

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

The square root of 161920827 is about 12724.8114720808. The cubic root of 161920827 is about 545.0473566570.

Adding to 161920827 its reverse (728029161), we get a palindrome (889949988).

The spelling of 161920827 in words is "one hundred sixty-one million, nine hundred twenty thousand, eight hundred twenty-seven".