85505261 has 4 divisors (see below), whose sum is σ = 87816252. Its totient is φ = 83194272.

The previous prime is 85505239. The next prime is 85505279. The reversal of 85505261 is 16250558.

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 36421225 + 49084036 = 6035^2 + 7006^2 .

It is a cyclic number.

It is not a de Polignac number, because 85505261 - 2⁶ = 85505197 is a prime.

It is a super-2 number, since 2×85505261² = 14622299317356242, 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 (85505201) 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, 1155440 + ... + 1155513.

It is an arithmetic number, because the mean of its divisors is an integer number (21954063).

Almost surely, 2^85505261 is an apocalyptic number.

It is an amenable number.

85505261 is a deficient number, since it is larger than the sum of its proper divisors (2310991).

85505261 is a wasteful number, since it uses less digits than its factorization.

85505261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310990.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 85505261 is about 9246.9054823763. The cubic root of 85505261 is about 440.5524414232.

The spelling of 85505261 in words is "eighty-five million, five hundred five thousand, two hundred sixty-one".