661171 has 8 divisors (see below), whose sum is σ = 781920. Its totient is φ = 547008.

The previous prime is 661139. The next prime is 661183. The reversal of 661171 is 171166.

661171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 661171 - 2⁵ = 661139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661121) 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, 1426 + ... + 1831.

It is an arithmetic number, because the mean of its divisors is an integer number (97740).

2⁶⁶¹¹⁷¹ is an apocalyptic number.

661171 is a deficient number, since it is larger than the sum of its proper divisors (120749).

661171 is a wasteful number, since it uses less digits than its factorization.

661171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3293.

The product of its digits is 252, while the sum is 22.

The square root of 661171 is about 813.1242217521. The cubic root of 661171 is about 87.1173384795.

The spelling of 661171 in words is "six hundred sixty-one thousand, one hundred seventy-one".