1377243641 has 2 divisors, whose sum is σ = 1377243642. Its totient is φ = 1377243640.

The previous prime is 1377243617. The next prime is 1377243653. The reversal of 1377243641 is 1463427731.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1281282025 + 95961616 = 35795^2 + 9796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1377243641 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1377243595 and 1377243604.

It is not a weakly prime, because it can be changed into another prime (1377249641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688621820 + 688621821.

It is an arithmetic number, because the mean of its divisors is an integer number (688621821).

Almost surely, 2^1377243641 is an apocalyptic number.

It is an amenable number.

1377243641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377243641 is an equidigital number, since it uses as much as digits as its factorization.

1377243641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 38.

The square root of 1377243641 is about 37111.2333532584. The cubic root of 1377243641 is about 1112.5945424178.

The spelling of 1377243641 in words is "one billion, three hundred seventy-seven million, two hundred forty-three thousand, six hundred forty-one".