99945913 has 2 divisors, whose sum is σ = 99945914. Its totient is φ = 99945912.

The previous prime is 99945893. The next prime is 99945929. The reversal of 99945913 is 31954999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98664489 + 1281424 = 9933^2 + 1132^2 .

It is an emirp because it is prime and its reverse (31954999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99945913 - 2⁹ = 99945401 is a prime.

It is not a weakly prime, because it can be changed into another prime (99945973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49972956 + 49972957.

It is an arithmetic number, because the mean of its divisors is an integer number (49972957).

Almost surely, 2^99945913 is an apocalyptic number.

It is an amenable number.

99945913 is a deficient number, since it is larger than the sum of its proper divisors (1).

99945913 is an equidigital number, since it uses as much as digits as its factorization.

99945913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393660, while the sum is 49.

The square root of 99945913 is about 9997.2952842256. The cubic root of 99945913 is about 464.0751850644.

The spelling of 99945913 in words is "ninety-nine million, nine hundred forty-five thousand, nine hundred thirteen".