197951 has 4 divisors (see below), whose sum is σ = 213192. Its totient is φ = 182712.

The previous prime is 197947. The next prime is 197957. The reversal of 197951 is 159791.

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 197951 - 2² = 197947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197957) 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, 7601 + ... + 7626.

It is an arithmetic number, because the mean of its divisors is an integer number (53298).

2¹⁹⁷⁹⁵¹ is an apocalyptic number.

197951 is a deficient number, since it is larger than the sum of its proper divisors (15241).

197951 is a wasteful number, since it uses less digits than its factorization.

197951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15240.

The product of its digits is 2835, while the sum is 32.

The square root of 197951 is about 444.9168461634. The cubic root of 197951 is about 58.2799584332.

The spelling of 197951 in words is "one hundred ninety-seven thousand, nine hundred fifty-one".