99996521 has 2 divisors, whose sum is σ = 99996522. Its totient is φ = 99996520.

The previous prime is 99996517. The next prime is 99996551. The reversal of 99996521 is 12569999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98406400 + 1590121 = 9920^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 99996521 - 2² = 99996517 is a prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99996521.

It is not a weakly prime, because it can be changed into another prime (99996511) 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, 49998260 + 49998261.

It is an arithmetic number, because the mean of its divisors is an integer number (49998261).

Almost surely, 2^99996521 is an apocalyptic number.

It is an amenable number.

99996521 is a deficient number, since it is larger than the sum of its proper divisors (1).

99996521 is an equidigital number, since it uses as much as digits as its factorization.

99996521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 393660, while the sum is 50.

The square root of 99996521 is about 9999.8260484870. The cubic root of 99996521 is about 464.1535006030.

The spelling of 99996521 in words is "ninety-nine million, nine hundred ninety-six thousand, five hundred twenty-one".