711661 has 4 divisors (see below), whose sum is σ = 718300. Its totient is φ = 705024.

The previous prime is 711653. The next prime is 711679. The reversal of 711661 is 166117.

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 256036 + 455625 = 506^2 + 675^2 .

It is a cyclic number.

It is not a de Polignac number, because 711661 - 2³ = 711653 is a prime.

It is a super-2 number, since 2×711661² = 1012922757842, which contains 22 as substring.

It is a Duffinian number.

711661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (711691) 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, 3156 + ... + 3373.

It is an arithmetic number, because the mean of its divisors is an integer number (179575).

2⁷¹¹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

711661 is a deficient number, since it is larger than the sum of its proper divisors (6639).

711661 is a wasteful number, since it uses less digits than its factorization.

711661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6638.

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

The square root of 711661 is about 843.6000237079. The cubic root of 711661 is about 89.2807278587.

Adding to 711661 its reverse (166117), we get a palindrome (877778).

The spelling of 711661 in words is "seven hundred eleven thousand, six hundred sixty-one".