161869697 has 4 divisors (see below), whose sum is σ = 176585136. Its totient is φ = 147154260.

The previous prime is 161869637. The next prime is 161869703. The reversal of 161869697 is 796968161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 161869697 - 2⁶ = 161869633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161869637) 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, 7357703 + ... + 7357724.

It is an arithmetic number, because the mean of its divisors is an integer number (44146284).

Almost surely, 2^161869697 is an apocalyptic number.

It is an amenable number.

161869697 is a deficient number, since it is larger than the sum of its proper divisors (14715439).

161869697 is a wasteful number, since it uses less digits than its factorization.

161869697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14715438.

The product of its digits is 979776, while the sum is 53.

The square root of 161869697 is about 12722.8022463607. The cubic root of 161869697 is about 544.9899804572.

The spelling of 161869697 in words is "one hundred sixty-one million, eight hundred sixty-nine thousand, six hundred ninety-seven".