197831 has 2 divisors, whose sum is σ = 197832. Its totient is φ = 197830.

The previous prime is 197807. The next prime is 197837. The reversal of 197831 is 138791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197831 - 2⁶ = 197767 is a prime.

It is a super-2 number, since 2×197831² = 78274209122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 197794 and 197803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98915 + 98916.

It is an arithmetic number, because the mean of its divisors is an integer number (98916).

2¹⁹⁷⁸³¹ is an apocalyptic number.

197831 is a deficient number, since it is larger than the sum of its proper divisors (1).

197831 is an equidigital number, since it uses as much as digits as its factorization.

197831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 29.

The square root of 197831 is about 444.7819690590. The cubic root of 197831 is about 58.2681794093.

The spelling of 197831 in words is "one hundred ninety-seven thousand, eight hundred thirty-one".