85612561 has 16 divisors (see below), whose sum is σ = 93899520. Its totient is φ = 77725440.

The previous prime is 85612477. The next prime is 85612567. The reversal of 85612561 is 16521658.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 85612561 - 2⁷ = 85612433 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85612567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81880 + ... + 82918.

It is an arithmetic number, because the mean of its divisors is an integer number (5868720).

Almost surely, 2^85612561 is an apocalyptic number.

It is an amenable number.

85612561 is a deficient number, since it is larger than the sum of its proper divisors (8286959).

85612561 is a wasteful number, since it uses less digits than its factorization.

85612561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224.

The product of its digits is 14400, while the sum is 34.

The square root of 85612561 is about 9252.7056043084. The cubic root of 85612561 is about 440.7366465302.

The spelling of 85612561 in words is "eighty-five million, six hundred twelve thousand, five hundred sixty-one".