85009261 has 4 divisors (see below), whose sum is σ = 85261852. Its totient is φ = 84756672.

The previous prime is 85009241. The next prime is 85009273. The reversal of 85009261 is 16290058.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31573161 + 53436100 = 5619^2 + 7310^2 .

It is a cyclic number.

It is not a de Polignac number, because 85009261 - 2¹¹ = 85007213 is a prime.

It is a super-2 number, since 2×85009261² = 14453148911532242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85009201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125790 + ... + 126463.

It is an arithmetic number, because the mean of its divisors is an integer number (21315463).

Almost surely, 2^85009261 is an apocalyptic number.

It is an amenable number.

85009261 is a deficient number, since it is larger than the sum of its proper divisors (252591).

85009261 is a wasteful number, since it uses less digits than its factorization.

85009261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252590.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 85009261 is about 9220.0466918557. The cubic root of 85009261 is about 439.6989348867.

The spelling of 85009261 in words is "eighty-five million, nine thousand, two hundred sixty-one".