99955231 has 2 divisors, whose sum is σ = 99955232. Its totient is φ = 99955230.

The previous prime is 99955213. The next prime is 99955283. The reversal of 99955231 is 13255999.

Together with previous prime (99955213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (13255999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99955231 - 2⁷ = 99955103 is a prime.

It is a super-2 number, since 2×99955231² = 19982096408526722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99955201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49977615 + 49977616.

It is an arithmetic number, because the mean of its divisors is an integer number (49977616).

Almost surely, 2^99955231 is an apocalyptic number.

99955231 is a deficient number, since it is larger than the sum of its proper divisors (1).

99955231 is an equidigital number, since it uses as much as digits as its factorization.

99955231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109350, while the sum is 43.

The square root of 99955231 is about 9997.7612994110. The cubic root of 99955231 is about 464.0896065919.

The spelling of 99955231 in words is "ninety-nine million, nine hundred fifty-five thousand, two hundred thirty-one".