85561397 has 4 divisors (see below), whose sum is σ = 88511820. Its totient is φ = 82610976.

The previous prime is 85561393. The next prime is 85561417. The reversal of 85561397 is 79316558.

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 72063121 + 13498276 = 8489^2 + 3674^2 .

It is a cyclic number.

It is not a de Polignac number, because 85561397 - 2² = 85561393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85561393) 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 3 ways as a sum of consecutive naturals, for example, 1475168 + ... + 1475225.

It is an arithmetic number, because the mean of its divisors is an integer number (22127955).

Almost surely, 2^85561397 is an apocalyptic number.

It is an amenable number.

85561397 is a deficient number, since it is larger than the sum of its proper divisors (2950423).

85561397 is a wasteful number, since it uses less digits than its factorization.

85561397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950422.

The product of its digits is 226800, while the sum is 44.

The square root of 85561397 is about 9249.9403781862. The cubic root of 85561397 is about 440.6488309764.

It can be divided in two parts, 85561 and 397, that added together give a palindrome (85958).

The spelling of 85561397 in words is "eighty-five million, five hundred sixty-one thousand, three hundred ninety-seven".