197678231 has 2 divisors, whose sum is σ = 197678232. Its totient is φ = 197678230.

The previous prime is 197678219. The next prime is 197678237. The reversal of 197678231 is 132876791.

197678231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197678231 is a prime.

It is a super-2 number, since 2×197678231² = 78153366022578722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197678237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98839115 + 98839116.

It is an arithmetic number, because the mean of its divisors is an integer number (98839116).

Almost surely, 2^197678231 is an apocalyptic number.

197678231 is a deficient number, since it is larger than the sum of its proper divisors (1).

197678231 is an equidigital number, since it uses as much as digits as its factorization.

197678231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 44.

The square root of 197678231 is about 14059.8090669824. The cubic root of 197678231 is about 582.5317693443.

The spelling of 197678231 in words is "one hundred ninety-seven million, six hundred seventy-eight thousand, two hundred thirty-one".