99939551 has 2 divisors, whose sum is σ = 99939552. Its totient is φ = 99939550.

The previous prime is 99939527. The next prime is 99939557. The reversal of 99939551 is 15593999.

It is a strong prime.

It is an emirp because it is prime and its reverse (15593999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99939551 - 2¹⁸ = 99677407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99939551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99939557) 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, 49969775 + 49969776.

It is an arithmetic number, because the mean of its divisors is an integer number (49969776).

Almost surely, 2^99939551 is an apocalyptic number.

99939551 is a deficient number, since it is larger than the sum of its proper divisors (1).

99939551 is an equidigital number, since it uses as much as digits as its factorization.

99939551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 492075, while the sum is 50.

The square root of 99939551 is about 9996.9770931017. The cubic root of 99939551 is about 464.0653380419.

The spelling of 99939551 in words is "ninety-nine million, nine hundred thirty-nine thousand, five hundred fifty-one".