197148921 has 16 divisors (see below), whose sum is σ = 278149440. Its totient is φ = 123863040.

The previous prime is 197148899. The next prime is 197148929. The reversal of 197148921 is 129841791.

It is not a de Polignac number, because 197148921 - 2⁶ = 197148857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (197148929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2041 + ... + 19961.

It is an arithmetic number, because the mean of its divisors is an integer number (17384340).

Almost surely, 2^197148921 is an apocalyptic number.

It is an amenable number.

197148921 is a deficient number, since it is larger than the sum of its proper divisors (81000519).

197148921 is a wasteful number, since it uses less digits than its factorization.

197148921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18136.

The product of its digits is 36288, while the sum is 42.

The square root of 197148921 is about 14040.9729363745. The cubic root of 197148921 is about 582.0113689162.

The spelling of 197148921 in words is "one hundred ninety-seven million, one hundred forty-eight thousand, nine hundred twenty-one".