1381430621 has 2 divisors, whose sum is σ = 1381430622. Its totient is φ = 1381430620.

The previous prime is 1381430539. The next prime is 1381430639. The reversal of 1381430621 is 1260341831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 745836100 + 635594521 = 27310^2 + 25211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381430621 - 2¹⁰ = 1381429597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381430651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690715310 + 690715311.

It is an arithmetic number, because the mean of its divisors is an integer number (690715311).

Almost surely, 2^1381430621 is an apocalyptic number.

It is an amenable number.

1381430621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381430621 is an equidigital number, since it uses as much as digits as its factorization.

1381430621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1381430621 is about 37167.6017655162. The cubic root of 1381430621 is about 1113.7208738362.

The spelling of 1381430621 in words is "one billion, three hundred eighty-one million, four hundred thirty thousand, six hundred twenty-one".