196666831 has 2 divisors, whose sum is σ = 196666832. Its totient is φ = 196666830.

The previous prime is 196666819. The next prime is 196666837. The reversal of 196666831 is 138666691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 196666831 - 2⁷ = 196666703 is a prime.

It is a super-2 number, since 2×196666831² = 77355684831165122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196666837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98333415 + 98333416.

It is an arithmetic number, because the mean of its divisors is an integer number (98333416).

Almost surely, 2^196666831 is an apocalyptic number.

196666831 is a deficient number, since it is larger than the sum of its proper divisors (1).

196666831 is an equidigital number, since it uses as much as digits as its factorization.

196666831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 196666831 is about 14023.7951710655. The cubic root of 196666831 is about 581.5365825234.

The spelling of 196666831 in words is "one hundred ninety-six million, six hundred sixty-six thousand, eight hundred thirty-one".