195598421 has 2 divisors, whose sum is σ = 195598422. Its totient is φ = 195598420.

The previous prime is 195598399. The next prime is 195598427. The reversal of 195598421 is 124895591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194909521 + 688900 = 13961^2 + 830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195598421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195598427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97799210 + 97799211.

It is an arithmetic number, because the mean of its divisors is an integer number (97799211).

Almost surely, 2^195598421 is an apocalyptic number.

It is an amenable number.

195598421 is a deficient number, since it is larger than the sum of its proper divisors (1).

195598421 is an equidigital number, since it uses as much as digits as its factorization.

195598421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 44.

The square root of 195598421 is about 13985.6505390346. The cubic root of 195598421 is about 580.4815867394.

The spelling of 195598421 in words is "one hundred ninety-five million, five hundred ninety-eight thousand, four hundred twenty-one".