99999342181 has 2 divisors, whose sum is σ = 99999342182. Its totient is φ = 99999342180.

The previous prime is 99999342139. The next prime is 99999342193. The reversal of 99999342181 is 18124399999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82731016900 + 17268325281 = 287630^2 + 131409^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999342181 - 2¹³ = 99999333989 is a prime.

It is a super-2 number, since 2×99999342181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999671090 + 49999671091.

It is an arithmetic number, because the mean of its divisors is an integer number (49999671091).

Almost surely, 2^99999342181 is an apocalyptic number.

It is an amenable number.

99999342181 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999342181 is an equidigital number, since it uses as much as digits as its factorization.

99999342181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11337408, while the sum is 64.

The spelling of 99999342181 in words is "ninety-nine billion, nine hundred ninety-nine million, three hundred forty-two thousand, one hundred eighty-one".