197530921 has 8 divisors (see below), whose sum is σ = 225981440. Its totient is φ = 169138368.

The previous prime is 197530903. The next prime is 197530933. The reversal of 197530921 is 129035791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 197530921 - 2⁷ = 197530793 is a prime.

It is a super-2 number, since 2×197530921² = 78036929502216482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197530951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6921 + ... + 21046.

It is an arithmetic number, because the mean of its divisors is an integer number (28247680).

Almost surely, 2^197530921 is an apocalyptic number.

It is an amenable number.

197530921 is a deficient number, since it is larger than the sum of its proper divisors (28450519).

197530921 is a wasteful number, since it uses less digits than its factorization.

197530921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28983.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 197530921 is about 14054.5693993093. The cubic root of 197530921 is about 582.3870323151.

It can be divided in two parts, 1975 and 30921, that added together give a triangular number (32896 = T₂₅₆).

The spelling of 197530921 in words is "one hundred ninety-seven million, five hundred thirty thousand, nine hundred twenty-one".