189198587 has 2 divisors, whose sum is σ = 189198588. Its totient is φ = 189198586.

The previous prime is 189198571. The next prime is 189198589. The reversal of 189198587 is 785891981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189198587 - 2⁴ = 189198571 is a prime.

It is a super-2 number, since 2×189198587² = 71592210645593138, which contains 22 as substring.

Together with 189198589, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189198589) 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, 94599293 + 94599294.

It is an arithmetic number, because the mean of its divisors is an integer number (94599294).

Almost surely, 2^189198587 is an apocalyptic number.

189198587 is a deficient number, since it is larger than the sum of its proper divisors (1).

189198587 is an equidigital number, since it uses as much as digits as its factorization.

189198587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 56.

The square root of 189198587 is about 13754.9477279996. The cubic root of 189198587 is about 574.0802809119.

The spelling of 189198587 in words is "one hundred eighty-nine million, one hundred ninety-eight thousand, five hundred eighty-seven".