86611381 has 4 divisors (see below), whose sum is σ = 88245612. Its totient is φ = 84977152.

The previous prime is 86611363. The next prime is 86611387. The reversal of 86611381 is 18311668.

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 71673156 + 14938225 = 8466^2 + 3865^2 .

It is a cyclic number.

It is not a de Polignac number, because 86611381 - 2¹³ = 86603189 is a prime.

It is a super-2 number, since 2×86611381² = 15003062637454322, 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 (86611387) 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, 817036 + ... + 817141.

It is an arithmetic number, because the mean of its divisors is an integer number (22061403).

Almost surely, 2^86611381 is an apocalyptic number.

It is an amenable number.

86611381 is a deficient number, since it is larger than the sum of its proper divisors (1634231).

86611381 is a wasteful number, since it uses less digits than its factorization.

86611381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634230.

The product of its digits is 6912, while the sum is 34.

The square root of 86611381 is about 9306.5235722046. The cubic root of 86611381 is about 442.4440113442. Note that the first 3 decimals are identical.

The spelling of 86611381 in words is "eighty-six million, six hundred eleven thousand, three hundred eighty-one".