99691013 has 2 divisors, whose sum is σ = 99691014. Its totient is φ = 99691012.

The previous prime is 99691001. The next prime is 99691037. The reversal of 99691013 is 31019699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82864609 + 16826404 = 9103^2 + 4102^2 .

It is an emirp because it is prime and its reverse (31019699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99691013 - 2⁶ = 99690949 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 (99696013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49845506 + 49845507.

It is an arithmetic number, because the mean of its divisors is an integer number (49845507).

Almost surely, 2^99691013 is an apocalyptic number.

It is an amenable number.

99691013 is a deficient number, since it is larger than the sum of its proper divisors (1).

99691013 is an equidigital number, since it uses as much as digits as its factorization.

99691013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 99691013 is about 9984.5386974061. The cubic root of 99691013 is about 463.6803265933.

The spelling of 99691013 in words is "ninety-nine million, six hundred ninety-one thousand, thirteen".