99490639 has 2 divisors, whose sum is σ = 99490640. Its totient is φ = 99490638.

The previous prime is 99490637. The next prime is 99490649. The reversal of 99490639 is 93609499.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99490639 - 2¹ = 99490637 is a prime.

Together with 99490637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 99490592 and 99490601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99490637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49745319 + 49745320.

It is an arithmetic number, because the mean of its divisors is an integer number (49745320).

Almost surely, 2^99490639 is an apocalyptic number.

99490639 is a deficient number, since it is larger than the sum of its proper divisors (1).

99490639 is an equidigital number, since it uses as much as digits as its factorization.

99490639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 472392, while the sum is 49.

The square root of 99490639 is about 9974.4994360619. The cubic root of 99490639 is about 463.3694600588.

The spelling of 99490639 in words is "ninety-nine million, four hundred ninety thousand, six hundred thirty-nine".