197123813 has 2 divisors, whose sum is σ = 197123814. Its totient is φ = 197123812.

The previous prime is 197123747. The next prime is 197123837. The reversal of 197123813 is 318321791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113912929 + 83210884 = 10673^2 + 9122^2 .

It is a cyclic number.

It is not a de Polignac number, because 197123813 - 2¹² = 197119717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197123863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98561906 + 98561907.

It is an arithmetic number, because the mean of its divisors is an integer number (98561907).

Almost surely, 2^197123813 is an apocalyptic number.

It is an amenable number.

197123813 is a deficient number, since it is larger than the sum of its proper divisors (1).

197123813 is an equidigital number, since it uses as much as digits as its factorization.

197123813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 197123813 is about 14040.0788103201. The cubic root of 197123813 is about 581.9866604170.

The spelling of 197123813 in words is "one hundred ninety-seven million, one hundred twenty-three thousand, eight hundred thirteen".