99901553 has 2 divisors, whose sum is σ = 99901554. Its totient is φ = 99901552.

The previous prime is 99901541. The next prime is 99901567. The reversal of 99901553 is 35510999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77933584 + 21967969 = 8828^2 + 4687^2 .

It is an emirp because it is prime and its reverse (35510999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99901553 - 2¹⁰ = 99900529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99901553.

It is not a weakly prime, because it can be changed into another prime (99901253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49950776 + 49950777.

It is an arithmetic number, because the mean of its divisors is an integer number (49950777).

Almost surely, 2^99901553 is an apocalyptic number.

It is an amenable number.

99901553 is a deficient number, since it is larger than the sum of its proper divisors (1).

99901553 is an equidigital number, since it uses as much as digits as its factorization.

99901553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54675, while the sum is 41.

The square root of 99901553 is about 9995.0764379268. The cubic root of 99901553 is about 464.0065165182.

The spelling of 99901553 in words is "ninety-nine million, nine hundred one thousand, five hundred fifty-three".