99181937 has 2 divisors, whose sum is σ = 99181938. Its totient is φ = 99181936.

The previous prime is 99181903. The next prime is 99181939. The reversal of 99181937 is 73918199.

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., 99181681 + 256 = 9959^2 + 16^2 .

It is a cyclic number.

It is not a de Polignac number, because 99181937 - 2¹⁴ = 99165553 is a prime.

Together with 99181939, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 99181891 and 99181900.

It is not a weakly prime, because it can be changed into another prime (99181939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49590968 + 49590969.

It is an arithmetic number, because the mean of its divisors is an integer number (49590969).

Almost surely, 2^99181937 is an apocalyptic number.

It is an amenable number.

99181937 is a deficient number, since it is larger than the sum of its proper divisors (1).

99181937 is an equidigital number, since it uses as much as digits as its factorization.

99181937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 47.

The square root of 99181937 is about 9959.0128526878. The cubic root of 99181937 is about 462.8897121418.

It can be divided in two parts, 991 and 81937, that added together give a palindrome (82928).

The spelling of 99181937 in words is "ninety-nine million, one hundred eighty-one thousand, nine hundred thirty-seven".