189644513 has 2 divisors, whose sum is σ = 189644514. Its totient is φ = 189644512.

The previous prime is 189644471. The next prime is 189644519. The reversal of 189644513 is 315446981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183656704 + 5987809 = 13552^2 + 2447^2 .

It is a cyclic number.

It is not a de Polignac number, because 189644513 - 2¹² = 189640417 is a prime.

It is a super-3 number, since 3×189644513³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (189644519) 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 as a sum of consecutive naturals, namely, 94822256 + 94822257.

It is an arithmetic number, because the mean of its divisors is an integer number (94822257).

Almost surely, 2^189644513 is an apocalyptic number.

It is an amenable number.

189644513 is a deficient number, since it is larger than the sum of its proper divisors (1).

189644513 is an equidigital number, since it uses as much as digits as its factorization.

189644513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 189644513 is about 13771.1478461311. The cubic root of 189644513 is about 574.5309475343.

The spelling of 189644513 in words is "one hundred eighty-nine million, six hundred forty-four thousand, five hundred thirteen".