9900949 has 2 divisors, whose sum is σ = 9900950. Its totient is φ = 9900948.

The previous prime is 9900931. The next prime is 9900959. The reversal of 9900949 is 9490099.

9900949 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9878449 + 22500 = 3143^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 9900949 - 2⁹ = 9900437 is a prime.

It is a super-2 number, since 2×9900949² = 196057582201202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9900959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4950474 + 4950475.

It is an arithmetic number, because the mean of its divisors is an integer number (4950475).

Almost surely, 2^9900949 is an apocalyptic number.

It is an amenable number.

9900949 is a deficient number, since it is larger than the sum of its proper divisors (1).

9900949 is an equidigital number, since it uses as much as digits as its factorization.

9900949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 9900949 is about 3146.5773468961. The cubic root of 9900949 is about 214.7297776944.

The spelling of 9900949 in words is "nine million, nine hundred thousand, nine hundred forty-nine".