197871742069 has 4 divisors (see below), whose sum is σ = 198219496140. Its totient is φ = 197523988000.

The previous prime is 197871742039. The next prime is 197871742153. The reversal of 197871742069 is 960247178791.

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

It can be written as a sum of positive squares in 2 ways, for example, as 71630099044 + 126241643025 = 267638^2 + 355305^2 .

It is a cyclic number.

It is not a de Polignac number, because 197871742069 - 2⁷ = 197871741941 is a prime.

It is a super-2 number, since 2×197871742069² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 197871741998 and 197871742016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197871742039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173876182 + ... + 173877319.

It is an arithmetic number, because the mean of its divisors is an integer number (49554874035).

Almost surely, 2^197871742069 is an apocalyptic number.

It is an amenable number.

197871742069 is a deficient number, since it is larger than the sum of its proper divisors (347754071).

197871742069 is an equidigital number, since it uses as much as digits as its factorization.

197871742069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347754070.

The product of its (nonzero) digits is 10668672, while the sum is 61.

The spelling of 197871742069 in words is "one hundred ninety-seven billion, eight hundred seventy-one million, seven hundred forty-two thousand, sixty-nine".