1381694641 has 2 divisors, whose sum is σ = 1381694642. Its totient is φ = 1381694640.

The previous prime is 1381694623. The next prime is 1381694653. The reversal of 1381694641 is 1464961831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 829209616 + 552485025 = 28796^2 + 23505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381694641 - 2⁷ = 1381694513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1381694621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690847320 + 690847321.

It is an arithmetic number, because the mean of its divisors is an integer number (690847321).

Almost surely, 2^1381694641 is an apocalyptic number.

It is an amenable number.

1381694641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381694641 is an equidigital number, since it uses as much as digits as its factorization.

1381694641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 43.

The square root of 1381694641 is about 37171.1533450336. The cubic root of 1381694641 is about 1113.7918210243.

The spelling of 1381694641 in words is "one billion, three hundred eighty-one million, six hundred ninety-four thousand, six hundred forty-one".