86043721 has 2 divisors, whose sum is σ = 86043722. Its totient is φ = 86043720.

The previous prime is 86043709. The next prime is 86043743. The reversal of 86043721 is 12734068.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77633721 + 8410000 = 8811^2 + 2900^2 .

It is a cyclic number.

It is not a de Polignac number, because 86043721 - 2²³ = 77655113 is a prime.

It is not a weakly prime, because it can be changed into another prime (86043701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43021860 + 43021861.

It is an arithmetic number, because the mean of its divisors is an integer number (43021861).

Almost surely, 2^86043721 is an apocalyptic number.

It is an amenable number.

86043721 is a deficient number, since it is larger than the sum of its proper divisors (1).

86043721 is an equidigital number, since it uses as much as digits as its factorization.

86043721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 86043721 is about 9275.9754743100. The cubic root of 86043721 is about 441.4752838476.

Adding to 86043721 its reverse (12734068), we get a palindrome (98777789).

The spelling of 86043721 in words is "eighty-six million, forty-three thousand, seven hundred twenty-one".