1381875457 has 2 divisors, whose sum is σ = 1381875458. Its totient is φ = 1381875456.

The previous prime is 1381875427. The next prime is 1381875497. The reversal of 1381875457 is 7545781831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 765296896 + 616578561 = 27664^2 + 24831^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381875457 - 2⁷ = 1381875329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1381875457.

It is not a weakly prime, because it can be changed into another prime (1381875427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690937728 + 690937729.

It is an arithmetic number, because the mean of its divisors is an integer number (690937729).

Almost surely, 2^1381875457 is an apocalyptic number.

It is an amenable number.

1381875457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381875457 is an equidigital number, since it uses as much as digits as its factorization.

1381875457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 940800, while the sum is 49.

The square root of 1381875457 is about 37173.5854740971. The cubic root of 1381875457 is about 1113.8404045033.

The spelling of 1381875457 in words is "one billion, three hundred eighty-one million, eight hundred seventy-five thousand, four hundred fifty-seven".