84031231 has 2 divisors, whose sum is σ = 84031232. Its totient is φ = 84031230.

The previous prime is 84031223. The next prime is 84031237. The reversal of 84031231 is 13213048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84031231 - 2³ = 84031223 is a prime.

It is a super-2 number, since 2×84031231² = 14122495566750722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84031237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42015615 + 42015616.

It is an arithmetic number, because the mean of its divisors is an integer number (42015616).

Almost surely, 2^84031231 is an apocalyptic number.

84031231 is a deficient number, since it is larger than the sum of its proper divisors (1).

84031231 is an equidigital number, since it uses as much as digits as its factorization.

84031231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 84031231 is about 9166.8550223073. The cubic root of 84031231 is about 438.0061837565.

Adding to 84031231 its reverse (13213048), we get a palindrome (97244279).

The spelling of 84031231 in words is "eighty-four million, thirty-one thousand, two hundred thirty-one".