189549431 has 2 divisors, whose sum is σ = 189549432. Its totient is φ = 189549430.

The previous prime is 189549421. The next prime is 189549443. The reversal of 189549431 is 134945981.

It is a weak prime.

It is an emirp because it is prime and its reverse (134945981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189549431 - 2¹⁰ = 189548407 is a prime.

It is a super-2 number, since 2×189549431² = 71857973584847522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189549421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94774715 + 94774716.

It is an arithmetic number, because the mean of its divisors is an integer number (94774716).

Almost surely, 2^189549431 is an apocalyptic number.

189549431 is a deficient number, since it is larger than the sum of its proper divisors (1).

189549431 is an equidigital number, since it uses as much as digits as its factorization.

189549431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 189549431 is about 13767.6951956382. The cubic root of 189549431 is about 574.4349140262.

The spelling of 189549431 in words is "one hundred eighty-nine million, five hundred forty-nine thousand, four hundred thirty-one".