1376787641 has 2 divisors, whose sum is σ = 1376787642. Its totient is φ = 1376787640.

The previous prime is 1376787637. The next prime is 1376787677. The reversal of 1376787641 is 1467876731.

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., 1186458025 + 190329616 = 34445^2 + 13796^2 .

It is a cyclic number.

It is not a de Polignac number, because 1376787641 - 2² = 1376787637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1376787641.

It is not a weakly prime, because it can be changed into another prime (1376787691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688393820 + 688393821.

It is an arithmetic number, because the mean of its divisors is an integer number (688393821).

Almost surely, 2^1376787641 is an apocalyptic number.

It is an amenable number.

1376787641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1376787641 is an equidigital number, since it uses as much as digits as its factorization.

1376787641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1185408, while the sum is 50.

The square root of 1376787641 is about 37105.0891522982. The cubic root of 1376787641 is about 1112.4717369582.

The spelling of 1376787641 in words is "one billion, three hundred seventy-six million, seven hundred eighty-seven thousand, six hundred forty-one".