1331656 has 8 divisors (see below), whose sum is σ = 2496870. Its totient is φ = 665824.

The previous prime is 1331647. The next prime is 1331657. The reversal of 1331656 is 6561331.

It can be written as a sum of positive squares in only one way, i.e., 1276900 + 54756 = 1130^2 + 234^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1331656.

It is not an unprimeable number, because it can be changed into a prime (1331657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83221 + ... + 83236.

2^1331656 is an apocalyptic number.

It is an amenable number.

1331656 is a deficient number, since it is larger than the sum of its proper divisors (1165214).

1331656 is a wasteful number, since it uses less digits than its factorization.

1331656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166463 (or 166459 counting only the distinct ones).

The product of its digits is 1620, while the sum is 25.

The square root of 1331656 is about 1153.9740031734. The cubic root of 1331656 is about 110.0180686572.

Adding to 1331656 its reverse (6561331), we get a palindrome (7892987).

The spelling of 1331656 in words is "one million, three hundred thirty-one thousand, six hundred fifty-six".