86429621 has 2 divisors, whose sum is σ = 86429622. Its totient is φ = 86429620.

The previous prime is 86429617. The next prime is 86429641. The reversal of 86429621 is 12692468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47803396 + 38626225 = 6914^2 + 6215^2 .

It is a cyclic number.

It is not a de Polignac number, because 86429621 - 2² = 86429617 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86429611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43214810 + 43214811.

It is an arithmetic number, because the mean of its divisors is an integer number (43214811).

Almost surely, 2^86429621 is an apocalyptic number.

It is an amenable number.

86429621 is a deficient number, since it is larger than the sum of its proper divisors (1).

86429621 is an equidigital number, since it uses as much as digits as its factorization.

86429621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 86429621 is about 9296.7532504633. The cubic root of 86429621 is about 442.1342947576.

The spelling of 86429621 in words is "eighty-six million, four hundred twenty-nine thousand, six hundred twenty-one".