161972996 has 6 divisors (see below), whose sum is σ = 283452750. Its totient is φ = 80986496.

The previous prime is 161972981. The next prime is 161972999. The reversal of 161972996 is 699279161.

161972996 is digitally balanced in base 3, 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., 124322500 + 37650496 = 11150^2 + 6136^2 .

It is not an unprimeable number, because it can be changed into a prime (161972999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20246621 + ... + 20246628.

It is an arithmetic number, because the mean of its divisors is an integer number (47242125).

Almost surely, 2^161972996 is an apocalyptic number.

It is an amenable number.

161972996 is a deficient number, since it is larger than the sum of its proper divisors (121479754).

161972996 is a wasteful number, since it uses less digits than its factorization.

161972996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40493253 (or 40493251 counting only the distinct ones).

The product of its digits is 367416, while the sum is 50.

The square root of 161972996 is about 12726.8611998403. The cubic root of 161972996 is about 545.1058863365.

The spelling of 161972996 in words is "one hundred sixty-one million, nine hundred seventy-two thousand, nine hundred ninety-six".