99640949 has 2 divisors, whose sum is σ = 99640950. Its totient is φ = 99640948.

The previous prime is 99640943. The next prime is 99640951. The reversal of 99640949 is 94904699.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99640324 + 625 = 9982^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 99640949 - 2¹² = 99636853 is a prime.

Together with 99640951, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 99640897 and 99640906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99640943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49820474 + 49820475.

It is an arithmetic number, because the mean of its divisors is an integer number (49820475).

Almost surely, 2^99640949 is an apocalyptic number.

It is an amenable number.

99640949 is a deficient number, since it is larger than the sum of its proper divisors (1).

99640949 is an equidigital number, since it uses as much as digits as its factorization.

99640949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 99640949 is about 9982.0313063023. The cubic root of 99640949 is about 463.6026947916.

The spelling of 99640949 in words is "ninety-nine million, six hundred forty thousand, nine hundred forty-nine".