85201581 has 8 divisors (see below), whose sum is σ = 115745760. Its totient is φ = 55729232.

The previous prime is 85201577. The next prime is 85201583. The reversal of 85201581 is 18510258.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85201581 - 2² = 85201577 is a prime.

It is a super-2 number, since 2×85201581² = 14518618809799122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85201583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267771 + ... + 268088.

It is an arithmetic number, because the mean of its divisors is an integer number (14468220).

Almost surely, 2^85201581 is an apocalyptic number.

It is an amenable number.

85201581 is a deficient number, since it is larger than the sum of its proper divisors (30544179).

85201581 is a wasteful number, since it uses less digits than its factorization.

85201581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535915.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 85201581 is about 9230.4702480426. The cubic root of 85201581 is about 440.0302682346.

It can be divided in two parts, 8520 and 1581, that added together give a palindrome (10101).

The spelling of 85201581 in words is "eighty-five million, two hundred one thousand, five hundred eighty-one".