197447961 has 4 divisors (see below), whose sum is σ = 263263952. Its totient is φ = 131631972.

The previous prime is 197447927. The next prime is 197447977. The reversal of 197447961 is 169744791.

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.

It is a de Polignac number, because none of the positive numbers 2^k-197447961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197447961.

It is not an unprimeable number, because it can be changed into a prime (197447161) 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 3 ways as a sum of consecutive naturals, for example, 32907991 + ... + 32907996.

It is an arithmetic number, because the mean of its divisors is an integer number (65815988).

Almost surely, 2^197447961 is an apocalyptic number.

It is an amenable number.

197447961 is a deficient number, since it is larger than the sum of its proper divisors (65815991).

197447961 is an equidigital number, since it uses as much as digits as its factorization.

197447961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65815990.

The product of its digits is 381024, while the sum is 48.

The square root of 197447961 is about 14051.6177360473. The cubic root of 197447961 is about 582.3054896493.

The spelling of 197447961 in words is "one hundred ninety-seven million, four hundred forty-seven thousand, nine hundred sixty-one".