189491519 has 4 divisors (see below), whose sum is σ = 216561744. Its totient is φ = 162421296.

The previous prime is 189491501. The next prime is 189491527. The reversal of 189491519 is 915194981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 915194981 = 277 ⋅3303953.

It is a cyclic number.

It is not a de Polignac number, because 189491519 - 2¹⁶ = 189425983 is a prime.

It is a super-2 number, since 2×189491519² = 71814071545854722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189491219) 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, 13535102 + ... + 13535115.

It is an arithmetic number, because the mean of its divisors is an integer number (54140436).

Almost surely, 2^189491519 is an apocalyptic number.

189491519 is a deficient number, since it is larger than the sum of its proper divisors (27070225).

189491519 is an equidigital number, since it uses as much as digits as its factorization.

189491519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27070224.

The product of its digits is 116640, while the sum is 47.

The square root of 189491519 is about 13765.5918506979. The cubic root of 189491519 is about 574.3764067491.

The spelling of 189491519 in words is "one hundred eighty-nine million, four hundred ninety-one thousand, five hundred nineteen".