85018621 has 2 divisors, whose sum is σ = 85018622. Its totient is φ = 85018620.

The previous prime is 85018613. The next prime is 85018663. The reversal of 85018621 is 12681058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84548025 + 470596 = 9195^2 + 686^2 .

It is a cyclic number.

It is not a de Polignac number, because 85018621 - 2³ = 85018613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85018121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42509310 + 42509311.

It is an arithmetic number, because the mean of its divisors is an integer number (42509311).

Almost surely, 2^85018621 is an apocalyptic number.

It is an amenable number.

85018621 is a deficient number, since it is larger than the sum of its proper divisors (1).

85018621 is an equidigital number, since it uses as much as digits as its factorization.

85018621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 85018621 is about 9220.5542675047. The cubic root of 85018621 is about 439.7150720736.

Adding to 85018621 its reverse (12681058), we get a palindrome (97699679).

The spelling of 85018621 in words is "eighty-five million, eighteen thousand, six hundred twenty-one".