99143917 has 2 divisors, whose sum is σ = 99143918. Its totient is φ = 99143916.

The previous prime is 99143911. The next prime is 99143927. The reversal of 99143917 is 71934199.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55860676 + 43283241 = 7474^2 + 6579^2 .

It is an emirp because it is prime and its reverse (71934199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99143917 - 2³ = 99143909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99143911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49571958 + 49571959.

It is an arithmetic number, because the mean of its divisors is an integer number (49571959).

Almost surely, 2^99143917 is an apocalyptic number.

It is an amenable number.

99143917 is a deficient number, since it is larger than the sum of its proper divisors (1).

99143917 is an equidigital number, since it uses as much as digits as its factorization.

99143917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 43.

The square root of 99143917 is about 9957.1038459986. The cubic root of 99143917 is about 462.8305571631.

It can be divided in two parts, 9914 and 3917, that added together give a palindrome (13831).

The spelling of 99143917 in words is "ninety-nine million, one hundred forty-three thousand, nine hundred seventeen".