189539531 has 2 divisors, whose sum is σ = 189539532. Its totient is φ = 189539530.

The previous prime is 189539509. The next prime is 189539587. The reversal of 189539531 is 135935981.

It is a weak prime.

It is an emirp because it is prime and its reverse (135935981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189539531 - 2¹⁰ = 189538507 is a prime.

It is a super-2 number, since 2×189539531² = 71850467623399922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (189539591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94769765 + 94769766.

It is an arithmetic number, because the mean of its divisors is an integer number (94769766).

Almost surely, 2^189539531 is an apocalyptic number.

189539531 is a deficient number, since it is larger than the sum of its proper divisors (1).

189539531 is an equidigital number, since it uses as much as digits as its factorization.

189539531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 44.

The square root of 189539531 is about 13767.3356536405. The cubic root of 189539531 is about 574.4249131087.

The spelling of 189539531 in words is "one hundred eighty-nine million, five hundred thirty-nine thousand, five hundred thirty-one".