197891319 has 4 divisors (see below), whose sum is σ = 263855096. Its totient is φ = 131927544.

The previous prime is 197891303. The next prime is 197891417. The reversal of 197891319 is 913198791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 913198791 = 3 ⋅304399597.

It is not a de Polignac number, because 197891319 - 2⁴ = 197891303 is a prime.

It is a super-2 number, since 2×197891319² = 78321948271119522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197811319) 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, 32981884 + ... + 32981889.

It is an arithmetic number, because the mean of its divisors is an integer number (65963774).

Almost surely, 2^197891319 is an apocalyptic number.

197891319 is a deficient number, since it is larger than the sum of its proper divisors (65963777).

197891319 is an equidigital number, since it uses as much as digits as its factorization.

197891319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65963776.

The product of its digits is 122472, while the sum is 48.

The square root of 197891319 is about 14067.3849382179. The cubic root of 197891319 is about 582.7410082902.

The spelling of 197891319 in words is "one hundred ninety-seven million, eight hundred ninety-one thousand, three hundred nineteen".