189455731 has 4 divisors (see below), whose sum is σ = 193486752. Its totient is φ = 185424712.

The previous prime is 189455729. The next prime is 189455741. The reversal of 189455731 is 137554981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137554981 = 53 ⋅2595377.

It is a cyclic number.

It is not a de Polignac number, because 189455731 - 2¹ = 189455729 is a prime.

It is a super-2 number, since 2×189455731² = 71786948017488722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189455741) 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, 2015440 + ... + 2015533.

It is an arithmetic number, because the mean of its divisors is an integer number (48371688).

Almost surely, 2^189455731 is an apocalyptic number.

189455731 is a deficient number, since it is larger than the sum of its proper divisors (4031021).

189455731 is an equidigital number, since it uses as much as digits as its factorization.

189455731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4031020.

The product of its digits is 151200, while the sum is 43.

The square root of 189455731 is about 13764.2918815317. The cubic root of 189455731 is about 574.3402449248.

The spelling of 189455731 in words is "one hundred eighty-nine million, four hundred fifty-five thousand, seven hundred thirty-one".