189912459509 has 8 divisors (see below), whose sum is σ = 193817702232. Its totient is φ = 186019142400.

The previous prime is 189912459491. The next prime is 189912459521. The reversal of 189912459509 is 905954219981.

It can be written as a sum of positive squares in 4 ways, for example, as 130481333284 + 59431126225 = 361222^2 + 243785^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189912459509 - 2¹² = 189912455413 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 (189912459109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2949224 + ... + 3012929.

It is an arithmetic number, because the mean of its divisors is an integer number (24227212779).

Almost surely, 2^189912459509 is an apocalyptic number.

It is an amenable number.

189912459509 is a deficient number, since it is larger than the sum of its proper divisors (3905242723).

189912459509 is an equidigital number, since it uses as much as digits as its factorization.

189912459509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5962807.

The product of its (nonzero) digits is 10497600, while the sum is 62.

The spelling of 189912459509 in words is "one hundred eighty-nine billion, nine hundred twelve million, four hundred fifty-nine thousand, five hundred nine".