85280621 has 2 divisors, whose sum is σ = 85280622. Its totient is φ = 85280620.

The previous prime is 85280603. The next prime is 85280639. The reversal of 85280621 is 12608258.

It is a balanced prime because it is at equal distance from previous prime (85280603) and next prime (85280639).

It can be written as a sum of positive squares in only one way, i.e., 67732900 + 17547721 = 8230^2 + 4189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85280621 is a prime.

It is a Chen prime.

It is equal to p_4959023 and since 85280621 and 4959023 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85289621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42640310 + 42640311.

It is an arithmetic number, because the mean of its divisors is an integer number (42640311).

Almost surely, 2^85280621 is an apocalyptic number.

It is an amenable number.

85280621 is a deficient number, since it is larger than the sum of its proper divisors (1).

85280621 is an equidigital number, since it uses as much as digits as its factorization.

85280621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 85280621 is about 9234.7507275508. The cubic root of 85280621 is about 440.1662956126.

Adding to 85280621 its reverse (12608258), we get a palindrome (97888879).

The spelling of 85280621 in words is "eighty-five million, two hundred eighty thousand, six hundred twenty-one".