99518381 has 2 divisors, whose sum is σ = 99518382. Its totient is φ = 99518380.

The previous prime is 99518359. The next prime is 99518399. The reversal of 99518381 is 18381599.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99301225 + 217156 = 9965^2 + 466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99518381 is a prime.

It is a super-2 number, since 2×99518381² = 19807816313722322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99518351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49759190 + 49759191.

It is an arithmetic number, because the mean of its divisors is an integer number (49759191).

Almost surely, 2^99518381 is an apocalyptic number.

It is an amenable number.

99518381 is a deficient number, since it is larger than the sum of its proper divisors (1).

99518381 is an equidigital number, since it uses as much as digits as its factorization.

99518381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 44.

The square root of 99518381 is about 9975.8899853597. The cubic root of 99518381 is about 463.4125247500.

It can be divided in two parts, 99518 and 381, that added together give a palindrome (99899).

The spelling of 99518381 in words is "ninety-nine million, five hundred eighteen thousand, three hundred eighty-one".