191481491 has 8 divisors (see below), whose sum is σ = 195825600. Its totient is φ = 187174120.

The previous prime is 191481481. The next prime is 191481503. The reversal of 191481491 is 194184191.

It is a happy number.

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 191481491 - 2⁶ = 191481427 is a prime.

It is a super-2 number, since 2×191481491² = 73330322791166162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191481481) 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, 1496 + ... + 19626.

It is an arithmetic number, because the mean of its divisors is an integer number (24478200).

Almost surely, 2^191481491 is an apocalyptic number.

191481491 is a deficient number, since it is larger than the sum of its proper divisors (4344109).

191481491 is a wasteful number, since it uses less digits than its factorization.

191481491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18369.

The product of its digits is 10368, while the sum is 38.

The square root of 191481491 is about 13837.6837295842. The cubic root of 191481491 is about 576.3800409193.

The spelling of 191481491 in words is "one hundred ninety-one million, four hundred eighty-one thousand, four hundred ninety-one".