191740497 has 8 divisors (see below), whose sum is σ = 275319744. Its totient is φ = 117994128.

The previous prime is 191740463. The next prime is 191740513. The reversal of 191740497 is 794047191.

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

It is not a de Polignac number, because 191740497 - 2⁷ = 191740369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191740447) 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, 2458173 + ... + 2458250.

It is an arithmetic number, because the mean of its divisors is an integer number (34414968).

Almost surely, 2^191740497 is an apocalyptic number.

It is an amenable number.

191740497 is a deficient number, since it is larger than the sum of its proper divisors (83579247).

191740497 is a wasteful number, since it uses less digits than its factorization.

191740497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4916439.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 191740497 is about 13847.0392864323. The cubic root of 191740497 is about 576.6398025435.

The spelling of 191740497 in words is "one hundred ninety-one million, seven hundred forty thousand, four hundred ninety-seven".