188542813 has 4 divisors (see below), whose sum is σ = 189584668. Its totient is φ = 187500960.

The previous prime is 188542811. The next prime is 188542841. The reversal of 188542813 is 318245881.

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 23600164 + 164942649 = 4858^2 + 12843^2 .

It is a cyclic number.

It is not a de Polignac number, because 188542813 - 2¹ = 188542811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188542811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520656 + ... + 521017.

It is an arithmetic number, because the mean of its divisors is an integer number (47396167).

Almost surely, 2^188542813 is an apocalyptic number.

It is an amenable number.

188542813 is a deficient number, since it is larger than the sum of its proper divisors (1041855).

188542813 is a wasteful number, since it uses less digits than its factorization.

188542813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041854.

The product of its digits is 61440, while the sum is 40.

The square root of 188542813 is about 13731.0892867245. The cubic root of 188542813 is about 573.4162472103.

The spelling of 188542813 in words is "one hundred eighty-eight million, five hundred forty-two thousand, eight hundred thirteen".