161978283 has 6 divisors (see below), whose sum is σ = 233968644. Its totient is φ = 107985516.

The previous prime is 161978273. The next prime is 161978293. The reversal of 161978283 is 382879161.

161978283 is a `hidden beast` number, since 1 + 619 + 7 + 8 + 28 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (161978273) and next prime (161978293).

It is not a de Polignac number, because 161978283 - 2⁹ = 161977771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161978233) 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 5 ways as a sum of consecutive naturals, for example, 8998785 + ... + 8998802.

It is an arithmetic number, because the mean of its divisors is an integer number (38994774).

Almost surely, 2^161978283 is an apocalyptic number.

161978283 is a deficient number, since it is larger than the sum of its proper divisors (71990361).

161978283 is a wasteful number, since it uses less digits than its factorization.

161978283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17997593 (or 17997590 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 161978283 is about 12727.0689084329. The cubic root of 161978283 is about 545.1118172500. Note that the first 3 decimals are identical.

It can be divided in two parts, 161978 and 283, that added together give a palindrome (162261).

The spelling of 161978283 in words is "one hundred sixty-one million, nine hundred seventy-eight thousand, two hundred eighty-three".