99940231 has 2 divisors, whose sum is σ = 99940232. Its totient is φ = 99940230.

The previous prime is 99940223. The next prime is 99940241. The reversal of 99940231 is 13204999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99940231 - 2³ = 99940223 is a prime.

It is a super-2 number, since 2×99940231² = 19976099544666722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99940201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49970115 + 49970116.

It is an arithmetic number, because the mean of its divisors is an integer number (49970116).

Almost surely, 2^99940231 is an apocalyptic number.

99940231 is a deficient number, since it is larger than the sum of its proper divisors (1).

99940231 is an equidigital number, since it uses as much as digits as its factorization.

99940231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 99940231 is about 9997.0111033248. The cubic root of 99940231 is about 464.0663905572.

The spelling of 99940231 in words is "ninety-nine million, nine hundred forty thousand, two hundred thirty-one".