86517561 has 16 divisors (see below), whose sum is σ = 125807360. Its totient is φ = 52565760.

The previous prime is 86517521. The next prime is 86517589. The reversal of 86517561 is 16571568.

It is not a de Polignac number, because 86517561 - 2¹⁰ = 86516537 is a prime.

It is a super-2 number, since 2×86517561² = 14970576722777442, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86517511) 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, 10960 + ... + 17121.

It is an arithmetic number, because the mean of its divisors is an integer number (7862960).

Almost surely, 2^86517561 is an apocalyptic number.

It is an amenable number.

86517561 is a deficient number, since it is larger than the sum of its proper divisors (39289799).

86517561 is a wasteful number, since it uses less digits than its factorization.

86517561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28176.

The product of its digits is 50400, while the sum is 39.

The square root of 86517561 is about 9301.4816561664. The cubic root of 86517561 is about 442.2841974953.

It can be divided in two parts, 86517 and 561, that added together give a palindrome (87078).

The spelling of 86517561 in words is "eighty-six million, five hundred seventeen thousand, five hundred sixty-one".