99817651 has 2 divisors, whose sum is σ = 99817652. Its totient is φ = 99817650.

The previous prime is 99817649. The next prime is 99817667. The reversal of 99817651 is 15671899.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (15671899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99817651 - 2¹ = 99817649 is a prime.

Together with 99817649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99817691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49908825 + 49908826.

It is an arithmetic number, because the mean of its divisors is an integer number (49908826).

Almost surely, 2^99817651 is an apocalyptic number.

99817651 is a deficient number, since it is larger than the sum of its proper divisors (1).

99817651 is an equidigital number, since it uses as much as digits as its factorization.

99817651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 46.

The square root of 99817651 is about 9990.8783898114. The cubic root of 99817651 is about 463.8765820064.

The spelling of 99817651 in words is "ninety-nine million, eight hundred seventeen thousand, six hundred fifty-one".