99944521 has 2 divisors, whose sum is σ = 99944522. Its totient is φ = 99944520.

The previous prime is 99944501. The next prime is 99944543. The reversal of 99944521 is 12544999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67897600 + 32046921 = 8240^2 + 5661^2 .

It is an emirp because it is prime and its reverse (12544999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99944521 - 2⁷ = 99944393 is a prime.

It is not a weakly prime, because it can be changed into another prime (99944501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49972260 + 49972261.

It is an arithmetic number, because the mean of its divisors is an integer number (49972261).

Almost surely, 2^99944521 is an apocalyptic number.

It is an amenable number.

99944521 is a deficient number, since it is larger than the sum of its proper divisors (1).

99944521 is an equidigital number, since it uses as much as digits as its factorization.

99944521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 43.

The square root of 99944521 is about 9997.2256651533. The cubic root of 99944521 is about 464.0730305803.

The spelling of 99944521 in words is "ninety-nine million, nine hundred forty-four thousand, five hundred twenty-one".