86185621 has 4 divisors (see below), whose sum is σ = 86734732. Its totient is φ = 85636512.

The previous prime is 86185613. The next prime is 86185663. The reversal of 86185621 is 12658168.

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 54982225 + 31203396 = 7415^2 + 5586^2 .

It is a cyclic number.

It is not a de Polignac number, because 86185621 - 2³ = 86185613 is a prime.

It is a super-2 number, since 2×86185621² = 14855922534311282, 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 (86185601) 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, 274320 + ... + 274633.

It is an arithmetic number, because the mean of its divisors is an integer number (21683683).

Almost surely, 2^86185621 is an apocalyptic number.

It is an amenable number.

86185621 is a deficient number, since it is larger than the sum of its proper divisors (549111).

86185621 is a wasteful number, since it uses less digits than its factorization.

86185621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549110.

The product of its digits is 23040, while the sum is 37.

The square root of 86185621 is about 9283.6211146298. The cubic root of 86185621 is about 441.7178385866.

The spelling of 86185621 in words is "eighty-six million, one hundred eighty-five thousand, six hundred twenty-one".