99001743721 has 2 divisors, whose sum is σ = 99001743722. Its totient is φ = 99001743720.

The previous prime is 99001743683. The next prime is 99001743733. The reversal of 99001743721 is 12734710099.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75082028121 + 23919715600 = 274011^2 + 154660^2 .

It is a cyclic number.

It is not a de Polignac number, because 99001743721 - 2¹⁹ = 99001219433 is a prime.

It is not a weakly prime, because it can be changed into another prime (99001743751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49500871860 + 49500871861.

It is an arithmetic number, because the mean of its divisors is an integer number (49500871861).

Almost surely, 2^99001743721 is an apocalyptic number.

It is an amenable number.

99001743721 is a deficient number, since it is larger than the sum of its proper divisors (1).

99001743721 is an equidigital number, since it uses as much as digits as its factorization.

99001743721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 43.

The spelling of 99001743721 in words is "ninety-nine billion, one million, seven hundred forty-three thousand, seven hundred twenty-one".