197531 has 4 divisors (see below), whose sum is σ = 201312. Its totient is φ = 193752.

The previous prime is 197521. The next prime is 197539. The reversal of 197531 is 135791.

197531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135791 = 251 ⋅541.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197531 is a prime.

It is a super-2 number, since 2×197531² = 78036991922, which contains 22 as substring.

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 197531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197539) 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, 1811 + ... + 1916.

It is an arithmetic number, because the mean of its divisors is an integer number (50328).

2¹⁹⁷⁵³¹ is an apocalyptic number.

197531 is a deficient number, since it is larger than the sum of its proper divisors (3781).

197531 is an equidigital number, since it uses as much as digits as its factorization.

197531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3780.

The product of its digits is 945, while the sum is 26.

The square root of 197531 is about 444.4445972222. Note that the first 3 decimals coincide. The cubic root of 197531 is about 58.2387109955.

The spelling of 197531 in words is "one hundred ninety-seven thousand, five hundred thirty-one".