1381685447 has 2 divisors, whose sum is σ = 1381685448. Its totient is φ = 1381685446.

The previous prime is 1381685443. The next prime is 1381685497. The reversal of 1381685447 is 7445861831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1381685447 - 2² = 1381685443 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381685443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690842723 + 690842724.

It is an arithmetic number, because the mean of its divisors is an integer number (690842724).

Almost surely, 2^1381685447 is an apocalyptic number.

1381685447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381685447 is an equidigital number, since it uses as much as digits as its factorization.

1381685447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 47.

The square root of 1381685447 is about 37171.0296736585. The cubic root of 1381685447 is about 1113.7893505738.

The spelling of 1381685447 in words is "one billion, three hundred eighty-one million, six hundred eighty-five thousand, four hundred forty-seven".