99118531 has 2 divisors, whose sum is σ = 99118532. Its totient is φ = 99118530.

The previous prime is 99118529. The next prime is 99118553. The reversal of 99118531 is 13581199.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (13581199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99118531 - 2¹ = 99118529 is a prime.

It is a super-2 number, since 2×99118531² = 19648966375195922, which contains 22 as substring.

Together with 99118529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99118571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49559265 + 49559266.

It is an arithmetic number, because the mean of its divisors is an integer number (49559266).

Almost surely, 2^99118531 is an apocalyptic number.

99118531 is a deficient number, since it is larger than the sum of its proper divisors (1).

99118531 is an equidigital number, since it uses as much as digits as its factorization.

99118531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 37.

The square root of 99118531 is about 9955.8289961208. The cubic root of 99118531 is about 462.7910508916.

The spelling of 99118531 in words is "ninety-nine million, one hundred eighteen thousand, five hundred thirty-one".