99947231 has 2 divisors, whose sum is σ = 99947232. Its totient is φ = 99947230.

The previous prime is 99947207. The next prime is 99947273. The reversal of 99947231 is 13274999.

It is a weak prime.

It is an emirp because it is prime and its reverse (13274999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99947231 - 2¹⁴ = 99930847 is a prime.

It is a super-2 number, since 2×99947231² = 19978897969134722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99947291) 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, 49973615 + 49973616.

It is an arithmetic number, because the mean of its divisors is an integer number (49973616).

Almost surely, 2^99947231 is an apocalyptic number.

99947231 is a deficient number, since it is larger than the sum of its proper divisors (1).

99947231 is an equidigital number, since it uses as much as digits as its factorization.

99947231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 99947231 is about 9997.3612018372. The cubic root of 99947231 is about 464.0772249958.

The spelling of 99947231 in words is "ninety-nine million, nine hundred forty-seven thousand, two hundred thirty-one".