99018431 has 2 divisors, whose sum is σ = 99018432. Its totient is φ = 99018430.

The previous prime is 99018407. The next prime is 99018449. The reversal of 99018431 is 13481099.

It is a strong prime.

It is an emirp because it is prime and its reverse (13481099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99018431 - 2¹⁰ = 99017407 is a prime.

It is a super-2 number, since 2×99018431² = 19609299355403522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99018391 and 99018400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99014431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49509215 + 49509216.

It is an arithmetic number, because the mean of its divisors is an integer number (49509216).

Almost surely, 2^99018431 is an apocalyptic number.

99018431 is a deficient number, since it is larger than the sum of its proper divisors (1).

99018431 is an equidigital number, since it uses as much as digits as its factorization.

99018431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 99018431 is about 9950.8005205611. The cubic root of 99018431 is about 462.6352072191.

The spelling of 99018431 in words is "ninety-nine million, eighteen thousand, four hundred thirty-one".