85797421 has 2 divisors, whose sum is σ = 85797422. Its totient is φ = 85797420.

The previous prime is 85797409. The next prime is 85797433. The reversal of 85797421 is 12479758.

It is a balanced prime because it is at equal distance from previous prime (85797409) and next prime (85797433).

It can be written as a sum of positive squares in only one way, i.e., 79477225 + 6320196 = 8915^2 + 2514^2 .

It is a cyclic number.

It is not a de Polignac number, because 85797421 - 2⁵ = 85797389 is a prime.

It is a super-2 number, since 2×85797421² = 14722394900502482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85797121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42898710 + 42898711.

It is an arithmetic number, because the mean of its divisors is an integer number (42898711).

Almost surely, 2^85797421 is an apocalyptic number.

It is an amenable number.

85797421 is a deficient number, since it is larger than the sum of its proper divisors (1).

85797421 is an equidigital number, since it uses as much as digits as its factorization.

85797421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 43.

The square root of 85797421 is about 9262.6897281513. The cubic root of 85797421 is about 441.0536405324.

The spelling of 85797421 in words is "eighty-five million, seven hundred ninety-seven thousand, four hundred twenty-one".