191520097 has 4 divisors (see below), whose sum is σ = 191550256. Its totient is φ = 191489940.

The previous prime is 191520073. The next prime is 191520101. The reversal of 191520097 is 790025191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 790025191 = 107 ⋅7383413.

It is a cyclic number.

It is not a de Polignac number, because 191520097 - 2¹¹ = 191518049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191520037) 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, 1443 + ... + 19624.

It is an arithmetic number, because the mean of its divisors is an integer number (47887564).

Almost surely, 2^191520097 is an apocalyptic number.

It is an amenable number.

191520097 is a deficient number, since it is larger than the sum of its proper divisors (30159).

191520097 is an equidigital number, since it uses as much as digits as its factorization.

191520097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30158.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 191520097 is about 13839.0786181740. The cubic root of 191520097 is about 576.4187743977.

The spelling of 191520097 in words is "one hundred ninety-one million, five hundred twenty thousand, ninety-seven".