191489531 has 4 divisors (see below), whose sum is σ = 191525952. Its totient is φ = 191453112.

The previous prime is 191489503. The next prime is 191489561. The reversal of 191489531 is 135984191.

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 191489531 - 2¹⁴ = 191473147 is a prime.

It is a super-2 number, since 2×191489531² = 73336480965199922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191489561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8651 + ... + 21396.

It is an arithmetic number, because the mean of its divisors is an integer number (47881488).

Almost surely, 2^191489531 is an apocalyptic number.

191489531 is a deficient number, since it is larger than the sum of its proper divisors (36421).

191489531 is an equidigital number, since it uses as much as digits as its factorization.

191489531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36420.

The product of its digits is 38880, while the sum is 41.

The square root of 191489531 is about 13837.9742375826. The cubic root of 191489531 is about 576.3881078969.

The spelling of 191489531 in words is "one hundred ninety-one million, four hundred eighty-nine thousand, five hundred thirty-one".