99953681 has 2 divisors, whose sum is σ = 99953682. Its totient is φ = 99953680.

The previous prime is 99953657. The next prime is 99953731. The reversal of 99953681 is 18635999.

It is an a-pointer prime, because the next prime (99953731) can be obtained adding 99953681 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88529281 + 11424400 = 9409^2 + 3380^2 .

It is an emirp because it is prime and its reverse (18635999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99953681 - 2⁶ = 99953617 is a prime.

It is a super-2 number, since 2×99953681² = 19981476690899522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (99950681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49976840 + 49976841.

It is an arithmetic number, because the mean of its divisors is an integer number (49976841).

Almost surely, 2^99953681 is an apocalyptic number.

It is an amenable number.

99953681 is a deficient number, since it is larger than the sum of its proper divisors (1).

99953681 is an equidigital number, since it uses as much as digits as its factorization.

99953681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 50.

The square root of 99953681 is about 9997.6837817567. The cubic root of 99953681 is about 464.0872077093.

The spelling of 99953681 in words is "ninety-nine million, nine hundred fifty-three thousand, six hundred eighty-one".