196507621 has 2 divisors, whose sum is σ = 196507622. Its totient is φ = 196507620.

The previous prime is 196507613. The next prime is 196507631. The reversal of 196507621 is 126705691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140422500 + 56085121 = 11850^2 + 7489^2 .

It is a cyclic number.

It is not a de Polignac number, because 196507621 - 2³ = 196507613 is a prime.

It is a super-3 number, since 3×196507621³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196507601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98253810 + 98253811.

It is an arithmetic number, because the mean of its divisors is an integer number (98253811).

Almost surely, 2^196507621 is an apocalyptic number.

It is an amenable number.

196507621 is a deficient number, since it is larger than the sum of its proper divisors (1).

196507621 is an equidigital number, since it uses as much as digits as its factorization.

196507621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 196507621 is about 14018.1175983083. The cubic root of 196507621 is about 581.3796141211.

The spelling of 196507621 in words is "one hundred ninety-six million, five hundred seven thousand, six hundred twenty-one".