1381437457 has 2 divisors, whose sum is σ = 1381437458. Its totient is φ = 1381437456.

The previous prime is 1381437419. The next prime is 1381437509. The reversal of 1381437457 is 7547341831.

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., 1270851201 + 110586256 = 35649^2 + 10516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381437457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1381437157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690718728 + 690718729.

It is an arithmetic number, because the mean of its divisors is an integer number (690718729).

Almost surely, 2^1381437457 is an apocalyptic number.

It is an amenable number.

1381437457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381437457 is an equidigital number, since it uses as much as digits as its factorization.

1381437457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 43.

The square root of 1381437457 is about 37167.6937272142. The cubic root of 1381437457 is about 1113.7227109132.

The spelling of 1381437457 in words is "one billion, three hundred eighty-one million, four hundred thirty-seven thousand, four hundred fifty-seven".