99600401 has 2 divisors, whose sum is σ = 99600402. Its totient is φ = 99600400.

The previous prime is 99600377. The next prime is 99600407. The reversal of 99600401 is 10400699.

It is a Cunningham number, because it is equal to 9980²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99600400 + 1 = 9980^2 + 1^2 .

It is an emirp because it is prime and its reverse (10400699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99600401 - 2¹⁰ = 99599377 is a prime.

It is not a weakly prime, because it can be changed into another prime (99600407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49800200 + 49800201.

It is an arithmetic number, because the mean of its divisors is an integer number (49800201).

Almost surely, 2^99600401 is an apocalyptic number.

It is an amenable number.

99600401 is a deficient number, since it is larger than the sum of its proper divisors (1).

99600401 is an equidigital number, since it uses as much as digits as its factorization.

99600401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 99600401 is about 9980.0000501002. Note that the first 4 decimals coincide. The cubic root of 99600401 is about 463.5397999250.

It can be divided in two parts, 99600 and 401, that added together give a palindrome (100001).

The spelling of 99600401 in words is "ninety-nine million, six hundred thousand, four hundred one".