99694181 has 2 divisors, whose sum is σ = 99694182. Its totient is φ = 99694180.

The previous prime is 99694123. The next prime is 99694183. The reversal of 99694181 is 18149699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97337956 + 2356225 = 9866^2 + 1535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99694181 is a prime.

It is a super-2 number, since 2×99694181² = 19877859450521522, which contains 22 as substring.

Together with 99694183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99694183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49847090 + 49847091.

It is an arithmetic number, because the mean of its divisors is an integer number (49847091).

Almost surely, 2^99694181 is an apocalyptic number.

It is an amenable number.

99694181 is a deficient number, since it is larger than the sum of its proper divisors (1).

99694181 is an equidigital number, since it uses as much as digits as its factorization.

99694181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 47.

The square root of 99694181 is about 9984.6973414320. The cubic root of 99694181 is about 463.6852381818.

The spelling of 99694181 in words is "ninety-nine million, six hundred ninety-four thousand, one hundred eighty-one".