1381335421 has 2 divisors, whose sum is σ = 1381335422. Its totient is φ = 1381335420.

The previous prime is 1381335413. The next prime is 1381335433. The reversal of 1381335421 is 1245331831.

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., 1239392025 + 141943396 = 35205^2 + 11914^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381335421 - 2³ = 1381335413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381335401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690667710 + 690667711.

It is an arithmetic number, because the mean of its divisors is an integer number (690667711).

Almost surely, 2^1381335421 is an apocalyptic number.

It is an amenable number.

1381335421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381335421 is an equidigital number, since it uses as much as digits as its factorization.

1381335421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 1381335421 is about 37166.3210581838. The cubic root of 1381335421 is about 1113.6952895708.

The spelling of 1381335421 in words is "one billion, three hundred eighty-one million, three hundred thirty-five thousand, four hundred twenty-one".