197812831 has 2 divisors, whose sum is σ = 197812832. Its totient is φ = 197812830.

The previous prime is 197812817. The next prime is 197812837. The reversal of 197812831 is 138218791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197812831 - 2¹⁹ = 197288543 is a prime.

It is a super-2 number, since 2×197812831² = 78259832216469122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197812837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98906415 + 98906416.

It is an arithmetic number, because the mean of its divisors is an integer number (98906416).

Almost surely, 2^197812831 is an apocalyptic number.

197812831 is a deficient number, since it is larger than the sum of its proper divisors (1).

197812831 is an equidigital number, since it uses as much as digits as its factorization.

197812831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 40.

The square root of 197812831 is about 14064.5949461760. The cubic root of 197812831 is about 582.6639555174.

The spelling of 197812831 in words is "one hundred ninety-seven million, eight hundred twelve thousand, eight hundred thirty-one".