85539481 has 2 divisors, whose sum is σ = 85539482. Its totient is φ = 85539480.

The previous prime is 85539437. The next prime is 85539511. The reversal of 85539481 is 18493558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82083600 + 3455881 = 9060^2 + 1859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85539481 is a prime.

It is a super-2 number, since 2×85539481² = 14634005619498722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85530481) 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, 42769740 + 42769741.

It is an arithmetic number, because the mean of its divisors is an integer number (42769741).

Almost surely, 2^85539481 is an apocalyptic number.

It is an amenable number.

85539481 is a deficient number, since it is larger than the sum of its proper divisors (1).

85539481 is an equidigital number, since it uses as much as digits as its factorization.

85539481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 43.

The square root of 85539481 is about 9248.7556460315. The cubic root of 85539481 is about 440.6112046450.

The spelling of 85539481 in words is "eighty-five million, five hundred thirty-nine thousand, four hundred eighty-one".