1997161007 has 4 divisors (see below), whose sum is σ = 1997297280. Its totient is φ = 1997024736.

The previous prime is 1997160961. The next prime is 1997161021. The reversal of 1997161007 is 7001617991.

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

It is a cyclic number.

It is not a de Polignac number, because 1997161007 - 2⁸ = 1997160751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997161057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43082 + ... + 76487.

It is an arithmetic number, because the mean of its divisors is an integer number (499324320).

Almost surely, 2^1997161007 is an apocalyptic number.

1997161007 is a deficient number, since it is larger than the sum of its proper divisors (136273).

1997161007 is a wasteful number, since it uses less digits than its factorization.

1997161007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136272.

The product of its (nonzero) digits is 23814, while the sum is 41.

The square root of 1997161007 is about 44689.6073712894. The cubic root of 1997161007 is about 1259.3246164205.

Adding to 1997161007 its reverse (7001617991), we get a palindrome (8998778998).

The spelling of 1997161007 in words is "one billion, nine hundred ninety-seven million, one hundred sixty-one thousand, seven".