1331265757 has 2 divisors, whose sum is σ = 1331265758. Its totient is φ = 1331265756.

The previous prime is 1331265751. The next prime is 1331265773. The reversal of 1331265757 is 7575621331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 996412356 + 334853401 = 31566^2 + 18299^2 .

It is an emirp because it is prime and its reverse (7575621331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331265757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331265751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665632878 + 665632879.

It is an arithmetic number, because the mean of its divisors is an integer number (665632879).

Almost surely, 2^1331265757 is an apocalyptic number.

It is an amenable number.

1331265757 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331265757 is an equidigital number, since it uses as much as digits as its factorization.

1331265757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132300, while the sum is 40.

The square root of 1331265757 is about 36486.5147280471. The cubic root of 1331265757 is about 1100.0732064227.

The spelling of 1331265757 in words is "one billion, three hundred thirty-one million, two hundred sixty-five thousand, seven hundred fifty-seven".