8172661 has 8 divisors (see below), whose sum is σ = 9531200. Its totient is φ = 7004844.

The previous prime is 8172611. The next prime is 8172673. The reversal of 8172661 is 1662718.

It is not a de Polignac number, because 8172661 - 2¹³ = 8164469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8172611) 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, 11571 + ... + 12256.

It is an arithmetic number, because the mean of its divisors is an integer number (1191400).

Almost surely, 2^8172661 is an apocalyptic number.

It is an amenable number.

8172661 is a deficient number, since it is larger than the sum of its proper divisors (1358539).

8172661 is an equidigital number, since it uses as much as digits as its factorization.

8172661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23848 (or 23834 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 8172661 is about 2858.7866307229. The cubic root of 8172661 is about 201.4286126979.

The spelling of 8172661 in words is "eight million, one hundred seventy-two thousand, six hundred sixty-one".