197749128323 has 4 divisors (see below), whose sum is σ = 197750926680. Its totient is φ = 197747329968.

The previous prime is 197749128293. The next prime is 197749128389. The reversal of 197749128323 is 323821947791.

It is a happy number.

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 197749128323 - 2²² = 197744934019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197749128023) 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, 722690 + ... + 958007.

It is an arithmetic number, because the mean of its divisors is an integer number (49437731670).

Almost surely, 2^197749128323 is an apocalyptic number.

197749128323 is a deficient number, since it is larger than the sum of its proper divisors (1798357).

197749128323 is a wasteful number, since it uses less digits than its factorization.

197749128323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798356.

The product of its digits is 4572288, while the sum is 56.

The spelling of 197749128323 in words is "one hundred ninety-seven billion, seven hundred forty-nine million, one hundred twenty-eight thousand, three hundred twenty-three".