99943619 has 2 divisors, whose sum is σ = 99943620. Its totient is φ = 99943618.

The previous prime is 99943607. The next prime is 99943621. The reversal of 99943619 is 91634999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99943619 - 2¹⁶ = 99878083 is a prime.

It is a super-2 number, since 2×99943619² = 19977453957634322, which contains 22 as substring.

Together with 99943621, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99943639) 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, 49971809 + 49971810.

It is an arithmetic number, because the mean of its divisors is an integer number (49971810).

Almost surely, 2^99943619 is an apocalyptic number.

99943619 is a deficient number, since it is larger than the sum of its proper divisors (1).

99943619 is an equidigital number, since it uses as much as digits as its factorization.

99943619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472392, while the sum is 50.

The square root of 99943619 is about 9997.1805525358. The cubic root of 99943619 is about 464.0716344886.

The spelling of 99943619 in words is "ninety-nine million, nine hundred forty-three thousand, six hundred nineteen".