191497 has 2 divisors, whose sum is σ = 191498. Its totient is φ = 191496.

The previous prime is 191491. The next prime is 191507. The reversal of 191497 is 794191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121801 + 69696 = 349^2 + 264^2 .

It is an emirp because it is prime and its reverse (794191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191497 is a prime.

It is a super-2 number, since 2×191497² = 73342202018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (191491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95748 + 95749.

It is an arithmetic number, because the mean of its divisors is an integer number (95749).

2¹⁹¹⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

191497 is a deficient number, since it is larger than the sum of its proper divisors (1).

191497 is an equidigital number, since it uses as much as digits as its factorization.

191497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 31.

The square root of 191497 is about 437.6037019953. The cubic root of 191497 is about 57.6395601756.

The spelling of 191497 in words is "one hundred ninety-one thousand, four hundred ninety-seven".