86756521 has 4 divisors (see below), whose sum is σ = 86811472. Its totient is φ = 86701572.

The previous prime is 86756513. The next prime is 86756539. The reversal of 86756521 is 12565768.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 86756521 - 2³ = 86756513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86756561) 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, 25035 + ... + 28288.

It is an arithmetic number, because the mean of its divisors is an integer number (21702868).

Almost surely, 2^86756521 is an apocalyptic number.

It is an amenable number.

86756521 is a deficient number, since it is larger than the sum of its proper divisors (54951).

86756521 is a wasteful number, since it uses less digits than its factorization.

86756521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54950.

The product of its digits is 100800, while the sum is 40.

The square root of 86756521 is about 9314.3180641419. The cubic root of 86756521 is about 442.6910169379.

The spelling of 86756521 in words is "eighty-six million, seven hundred fifty-six thousand, five hundred twenty-one".