99969949 has 2 divisors, whose sum is σ = 99969950. Its totient is φ = 99969948.

The previous prime is 99969943. The next prime is 99970007. The reversal of 99969949 is 94996999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99141849 + 828100 = 9957^2 + 910^2 .

It is an emirp because it is prime and its reverse (94996999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99969949 - 2³ = 99969941 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 (99969941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49984974 + 49984975.

It is an arithmetic number, because the mean of its divisors is an integer number (49984975).

Almost surely, 2^99969949 is an apocalyptic number.

It is an amenable number.

99969949 is a deficient number, since it is larger than the sum of its proper divisors (1).

99969949 is an equidigital number, since it uses as much as digits as its factorization.

99969949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12754584, while the sum is 64.

The square root of 99969949 is about 9998.4973371002. The cubic root of 99969949 is about 464.1123839078.

The spelling of 99969949 in words is "ninety-nine million, nine hundred sixty-nine thousand, nine hundred forty-nine".