199553813 has 2 divisors, whose sum is σ = 199553814. Its totient is φ = 199553812.

The previous prime is 199553791. The next prime is 199553857. The reversal of 199553813 is 318355991.

It is an a-pointer prime, because the next prime (199553857) can be obtained adding 199553813 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163277284 + 36276529 = 12778^2 + 6023^2 .

It is a cyclic number.

It is not a de Polignac number, because 199553813 - 2²² = 195359509 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 (199553873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99776906 + 99776907.

It is an arithmetic number, because the mean of its divisors is an integer number (99776907).

Almost surely, 2^199553813 is an apocalyptic number.

It is an amenable number.

199553813 is a deficient number, since it is larger than the sum of its proper divisors (1).

199553813 is an equidigital number, since it uses as much as digits as its factorization.

199553813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145800, while the sum is 44.

The square root of 199553813 is about 14126.3517229326. The cubic root of 199553813 is about 584.3683376060.

The spelling of 199553813 in words is "one hundred ninety-nine million, five hundred fifty-three thousand, eight hundred thirteen".