188431523569 has 3 divisors (see below), whose sum is σ = 188431957657. Its totient is φ = 188431089482.

The previous prime is 188431523563. The next prime is 188431523593. The reversal of 188431523569 is 965325134881.

The square root of 188431523569 is 434087.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 188431523569 - 2⁹ = 188431523057 is a prime.

It is a super-2 number, since 2×188431523569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188431523563) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 217044 + ... + 651130.

Almost surely, 2^188431523569 is an apocalyptic number.

188431523569 is the 434087-th square number.

188431523569 is the 217044-th centered octagonal number.

It is an amenable number.

188431523569 is a deficient number, since it is larger than the sum of its proper divisors (434088).

188431523569 is an frugal number, since it uses more digits than its factorization.

188431523569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868174 (or 434087 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 55.

The spelling of 188431523569 in words is "one hundred eighty-eight billion, four hundred thirty-one million, five hundred twenty-three thousand, five hundred sixty-nine".