1331749 has 2 divisors, whose sum is σ = 1331750. Its totient is φ = 1331748.

The previous prime is 1331719. The next prime is 1331761. The reversal of 1331749 is 9471331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 980100 + 351649 = 990^2 + 593^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331749 - 2¹¹ = 1329701 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665874 + 665875.

It is an arithmetic number, because the mean of its divisors is an integer number (665875).

2^1331749 is an apocalyptic number.

It is an amenable number.

1331749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331749 is an equidigital number, since it uses as much as digits as its factorization.

1331749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 28.

The square root of 1331749 is about 1154.0142980050. The cubic root of 1331749 is about 110.0206297396.

It can be divided in two parts, 13317 and 49, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 1331749 in words is "one million, three hundred thirty-one thousand, seven hundred forty-nine".