196821613 has 2 divisors, whose sum is σ = 196821614. Its totient is φ = 196821612.

The previous prime is 196821601. The next prime is 196821619. The reversal of 196821613 is 316128691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134142724 + 62678889 = 11582^2 + 7917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196821613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196821619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98410806 + 98410807.

It is an arithmetic number, because the mean of its divisors is an integer number (98410807).

Almost surely, 2^196821613 is an apocalyptic number.

It is an amenable number.

196821613 is a deficient number, since it is larger than the sum of its proper divisors (1).

196821613 is an equidigital number, since it uses as much as digits as its factorization.

196821613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 196821613 is about 14029.3126346233. The cubic root of 196821613 is about 581.6891040771.

The spelling of 196821613 in words is "one hundred ninety-six million, eight hundred twenty-one thousand, six hundred thirteen".