1997161008 has 40 divisors (see below), whose sum is σ = 5161294656. Its totient is φ = 665467200.

The previous prime is 1997160961. The next prime is 1997161021. The reversal of 1997161008 is 8001617991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153643 + ... + 166133.

Almost surely, 2^1997161008 is an apocalyptic number.

It is an amenable number.

1997161008 is an abundant number, since it is smaller than the sum of its proper divisors (3164133648).

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

1997161008 is a wasteful number, since it uses less digits than its factorization.

1997161008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15833 (or 15827 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 42.

The square root of 1997161008 is about 44689.6073824776. The cubic root of 1997161008 is about 1259.3246166307.

Adding to 1997161008 its reverse (8001617991), we get a palindrome (9998778999).

The spelling of 1997161008 in words is "one billion, nine hundred ninety-seven million, one hundred sixty-one thousand, eight".