99999913381 has 2 divisors, whose sum is σ = 99999913382. Its totient is φ = 99999913380.

The previous prime is 99999913373. The next prime is 99999913393. The reversal of 99999913381 is 18331999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58479330625 + 41520582756 = 241825^2 + 203766^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999913381 - 2³ = 99999913373 is a prime.

It is a super-2 number, since 2×99999913381² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99999913381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99999911381) 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, 49999956690 + 49999956691.

It is an arithmetic number, because the mean of its divisors is an integer number (49999956691).

Almost surely, 2^99999913381 is an apocalyptic number.

It is an amenable number.

99999913381 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999913381 is an equidigital number, since it uses as much as digits as its factorization.

99999913381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38263752, while the sum is 70.

The spelling of 99999913381 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred thirteen thousand, three hundred eighty-one".