189762991 has 4 divisors (see below), whose sum is σ = 207014184. Its totient is φ = 172511800.

The previous prime is 189762967. The next prime is 189763003. The reversal of 189762991 is 199267981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 189762991 - 2⁹ = 189762479 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 (189762901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8625580 + ... + 8625601.

It is an arithmetic number, because the mean of its divisors is an integer number (51753546).

Almost surely, 2^189762991 is an apocalyptic number.

189762991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

189762991 is a deficient number, since it is larger than the sum of its proper divisors (17251193).

189762991 is a wasteful number, since it uses less digits than its factorization.

189762991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17251192.

The product of its digits is 489888, while the sum is 52.

The square root of 189762991 is about 13775.4488493116. The cubic root of 189762991 is about 574.6505662643.

The spelling of 189762991 in words is "one hundred eighty-nine million, seven hundred sixty-two thousand, nine hundred ninety-one".