189512493 has 4 divisors (see below), whose sum is σ = 252683328. Its totient is φ = 126341660.

The previous prime is 189512467. The next prime is 189512497. The reversal of 189512493 is 394215981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 189512493 - 2⁶ = 189512429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189512497) 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 3 ways as a sum of consecutive naturals, for example, 31585413 + ... + 31585418.

It is an arithmetic number, because the mean of its divisors is an integer number (63170832).

Almost surely, 2^189512493 is an apocalyptic number.

It is an amenable number.

189512493 is a deficient number, since it is larger than the sum of its proper divisors (63170835).

189512493 is an equidigital number, since it uses as much as digits as its factorization.

189512493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63170834.

The product of its digits is 77760, while the sum is 42.

The square root of 189512493 is about 13766.3536566514. The cubic root of 189512493 is about 574.3975977174.

The spelling of 189512493 in words is "one hundred eighty-nine million, five hundred twelve thousand, four hundred ninety-three".