85049581 has 2 divisors, whose sum is σ = 85049582. Its totient is φ = 85049580.

The previous prime is 85049579. The next prime is 85049611. The reversal of 85049581 is 18594058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51351556 + 33698025 = 7166^2 + 5805^2 .

It is a cyclic number.

It is not a de Polignac number, because 85049581 - 2¹ = 85049579 is a prime.

It is a super-2 number, since 2×85049581² = 14466862456551122, which contains 22 as substring.

Together with 85049579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85049501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42524790 + 42524791.

It is an arithmetic number, because the mean of its divisors is an integer number (42524791).

Almost surely, 2^85049581 is an apocalyptic number.

It is an amenable number.

85049581 is a deficient number, since it is larger than the sum of its proper divisors (1).

85049581 is an equidigital number, since it uses as much as digits as its factorization.

85049581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 85049581 is about 9222.2329725506. The cubic root of 85049581 is about 439.7684404860.

The spelling of 85049581 in words is "eighty-five million, forty-nine thousand, five hundred eighty-one".