99978041 has 2 divisors, whose sum is σ = 99978042. Its totient is φ = 99978040.

The previous prime is 99978029. The next prime is 99978059. The reversal of 99978041 is 14087999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79138816 + 20839225 = 8896^2 + 4565^2 .

It is an emirp because it is prime and its reverse (14087999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99978041 is a prime.

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 (99978001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49989020 + 49989021.

It is an arithmetic number, because the mean of its divisors is an integer number (49989021).

Almost surely, 2^99978041 is an apocalyptic number.

It is an amenable number.

99978041 is a deficient number, since it is larger than the sum of its proper divisors (1).

99978041 is an equidigital number, since it uses as much as digits as its factorization.

99978041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 99978041 is about 9998.9019897187. The cubic root of 99978041 is about 464.1249059911.

The spelling of 99978041 in words is "ninety-nine million, nine hundred seventy-eight thousand, forty-one".