197925891 has 4 divisors (see below), whose sum is σ = 263901192. Its totient is φ = 131950592.

The previous prime is 197925823. The next prime is 197925911. The reversal of 197925891 is 198529791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 197925891 - 2¹⁴ = 197909507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (192925891) 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, 32987646 + ... + 32987651.

It is an arithmetic number, because the mean of its divisors is an integer number (65975298).

Almost surely, 2^197925891 is an apocalyptic number.

197925891 is a deficient number, since it is larger than the sum of its proper divisors (65975301).

197925891 is an equidigital number, since it uses as much as digits as its factorization.

197925891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65975300.

The product of its digits is 408240, while the sum is 51.

The square root of 197925891 is about 14068.6136843685. The cubic root of 197925891 is about 582.7749416450.

The spelling of 197925891 in words is "one hundred ninety-seven million, nine hundred twenty-five thousand, eight hundred ninety-one".