189531997 has 8 divisors (see below), whose sum is σ = 202937400. Its totient is φ = 176377344.

The previous prime is 189531943. The next prime is 189532001. The reversal of 189531997 is 799135981.

It is a happy number.

189531997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 38266596 + 151265401 = 6186^2 + 12299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189531997 - 2²⁷ = 55314269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189531497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61122 + ... + 64147.

It is an arithmetic number, because the mean of its divisors is an integer number (25367175).

Almost surely, 2^189531997 is an apocalyptic number.

189531997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

189531997 is a deficient number, since it is larger than the sum of its proper divisors (13405403).

189531997 is a wasteful number, since it uses less digits than its factorization.

189531997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125375.

The product of its digits is 612360, while the sum is 52.

The square root of 189531997 is about 13767.0620322566. The cubic root of 189531997 is about 574.4173020761.

The spelling of 189531997 in words is "one hundred eighty-nine million, five hundred thirty-one thousand, nine hundred ninety-seven".