99644437 has 2 divisors, whose sum is σ = 99644438. Its totient is φ = 99644436.

The previous prime is 99644423. The next prime is 99644443. The reversal of 99644437 is 73444699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68574961 + 31069476 = 8281^2 + 5574^2 .

It is a cyclic number.

It is not a de Polignac number, because 99644437 - 2¹⁵ = 99611669 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99644407) 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, 49822218 + 49822219.

It is an arithmetic number, because the mean of its divisors is an integer number (49822219).

Almost surely, 2^99644437 is an apocalyptic number.

It is an amenable number.

99644437 is a deficient number, since it is larger than the sum of its proper divisors (1).

99644437 is an equidigital number, since it uses as much as digits as its factorization.

99644437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 46.

The square root of 99644437 is about 9982.2060187115. The cubic root of 99644437 is about 463.6081043056.

The spelling of 99644437 in words is "ninety-nine million, six hundred forty-four thousand, four hundred thirty-seven".