84430831 has 2 divisors, whose sum is σ = 84430832. Its totient is φ = 84430830.

The previous prime is 84430807. The next prime is 84430867. The reversal of 84430831 is 13803448.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84430831 - 2⁵ = 84430799 is a prime.

It is a super-2 number, since 2×84430831² = 14257130446701122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 84430793 and 84430802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84430531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42215415 + 42215416.

It is an arithmetic number, because the mean of its divisors is an integer number (42215416).

Almost surely, 2^84430831 is an apocalyptic number.

84430831 is a deficient number, since it is larger than the sum of its proper divisors (1).

84430831 is an equidigital number, since it uses as much as digits as its factorization.

84430831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 84430831 is about 9188.6250875743. The cubic root of 84430831 is about 438.6993806370.

The spelling of 84430831 in words is "eighty-four million, four hundred thirty thousand, eight hundred thirty-one".