1997161006 has 4 divisors (see below), whose sum is σ = 2995741512. Its totient is φ = 998580502.

The previous prime is 1997160961. The next prime is 1997161021. The reversal of 1997161006 is 6001617991.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1997161006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499290250 + ... + 499290253.

It is an arithmetic number, because the mean of its divisors is an integer number (748935378).

Almost surely, 2^1997161006 is an apocalyptic number.

1997161006 is a deficient number, since it is larger than the sum of its proper divisors (998580506).

1997161006 is an equidigital number, since it uses as much as digits as its factorization.

1997161006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998580505.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 1997161006 is about 44689.6073601011. The cubic root of 1997161006 is about 1259.3246162103.

Adding to 1997161006 its reverse (6001617991), we get a palindrome (7998778997).

The spelling of 1997161006 in words is "one billion, nine hundred ninety-seven million, one hundred sixty-one thousand, six".