99021551 has 2 divisors, whose sum is σ = 99021552. Its totient is φ = 99021550.

The previous prime is 99021541. The next prime is 99021553. The reversal of 99021551 is 15512099.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99021551 - 2⁶ = 99021487 is a prime.

It is a Sophie Germain prime.

Together with 99021553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99021553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49510775 + 49510776.

It is an arithmetic number, because the mean of its divisors is an integer number (49510776).

Almost surely, 2^99021551 is an apocalyptic number.

99021551 is a deficient number, since it is larger than the sum of its proper divisors (1).

99021551 is an equidigital number, since it uses as much as digits as its factorization.

99021551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 99021551 is about 9950.9572906329. The cubic root of 99021551 is about 462.6400662697.

The spelling of 99021551 in words is "ninety-nine million, twenty-one thousand, five hundred fifty-one".