1381455641 has 2 divisors, whose sum is σ = 1381455642. Its totient is φ = 1381455640.

The previous prime is 1381455619. The next prime is 1381455661. The reversal of 1381455641 is 1465541831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1353945616 + 27510025 = 36796^2 + 5245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381455641 - 2³⁰ = 307713817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1381455595 and 1381455604.

It is not a weakly prime, because it can be changed into another prime (1381455661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690727820 + 690727821.

It is an arithmetic number, because the mean of its divisors is an integer number (690727821).

Almost surely, 2^1381455641 is an apocalyptic number.

It is an amenable number.

1381455641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381455641 is an equidigital number, since it uses as much as digits as its factorization.

1381455641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 38.

The square root of 1381455641 is about 37167.9383474521. The cubic root of 1381455641 is about 1113.7275975731.

The spelling of 1381455641 in words is "one billion, three hundred eighty-one million, four hundred fifty-five thousand, six hundred forty-one".