197820013 has 2 divisors, whose sum is σ = 197820014. Its totient is φ = 197820012.

The previous prime is 197819983. The next prime is 197820023. The reversal of 197820013 is 310028791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153437769 + 44382244 = 12387^2 + 6662^2 .

It is a cyclic number.

It is not a de Polignac number, because 197820013 - 2⁵ = 197819981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197820023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98910006 + 98910007.

It is an arithmetic number, because the mean of its divisors is an integer number (98910007).

Almost surely, 2^197820013 is an apocalyptic number.

It is an amenable number.

197820013 is a deficient number, since it is larger than the sum of its proper divisors (1).

197820013 is an equidigital number, since it uses as much as digits as its factorization.

197820013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 197820013 is about 14064.8502658222. The cubic root of 197820013 is about 582.6710070348.

The spelling of 197820013 in words is "one hundred ninety-seven million, eight hundred twenty thousand, thirteen".