86501981 has 8 divisors (see below), whose sum is σ = 87945984. Its totient is φ = 85069440.

The previous prime is 86501971. The next prime is 86501999. The reversal of 86501981 is 18910568.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 86501981 - 2¹⁰ = 86500957 is a prime.

It is a super-2 number, since 2×86501981² = 14965185433848722, 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 (86501911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13076 + ... + 18546.

It is an arithmetic number, because the mean of its divisors is an integer number (10993248).

Almost surely, 2^86501981 is an apocalyptic number.

It is an amenable number.

86501981 is a deficient number, since it is larger than the sum of its proper divisors (1444003).

86501981 is a wasteful number, since it uses less digits than its factorization.

86501981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 86501981 is about 9300.6441174792. The cubic root of 86501981 is about 442.2576471958.

The spelling of 86501981 in words is "eighty-six million, five hundred one thousand, nine hundred eighty-one".