86573621 has 2 divisors, whose sum is σ = 86573622. Its totient is φ = 86573620.

The previous prime is 86573573. The next prime is 86573689. The reversal of 86573621 is 12637568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66422500 + 20151121 = 8150^2 + 4489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86573621 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 (86573521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43286810 + 43286811.

It is an arithmetic number, because the mean of its divisors is an integer number (43286811).

Almost surely, 2^86573621 is an apocalyptic number.

It is an amenable number.

86573621 is a deficient number, since it is larger than the sum of its proper divisors (1).

86573621 is an equidigital number, since it uses as much as digits as its factorization.

86573621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 86573621 is about 9304.4946665577. The cubic root of 86573621 is about 442.3797044978.

The spelling of 86573621 in words is "eighty-six million, five hundred seventy-three thousand, six hundred twenty-one".