188954526721 has 3 divisors (see below), whose sum is σ = 188954961411. Its totient is φ = 188954092032.

The previous prime is 188954526707. The next prime is 188954526749. The reversal of 188954526721 is 127625459881.

The square root of 188954526721 is 434689.

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 can be written as a sum of positive squares in only one way, i.e., 92804920321 + 96149606400 = 304639^2 + 310080^2 .

It is not a de Polignac number, because 188954526721 - 2²¹ = 188952429569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188954526701) 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 2 ways as a sum of consecutive naturals, for example, 217345 + ... + 652033.

It is an arithmetic number, because the mean of its divisors is an integer number (62984987137).

Almost surely, 2^188954526721 is an apocalyptic number.

188954526721 is the 434689-th square number.

188954526721 is the 217345-th centered octagonal number.

It is an amenable number.

188954526721 is a deficient number, since it is larger than the sum of its proper divisors (434690).

188954526721 is an frugal number, since it uses more digits than its factorization.

188954526721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869378 (or 434689 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 58.

The spelling of 188954526721 in words is "one hundred eighty-eight billion, nine hundred fifty-four million, five hundred twenty-six thousand, seven hundred twenty-one".