1355388128581 has 2 divisors, whose sum is σ = 1355388128582. Its totient is φ = 1355388128580.

The previous prime is 1355388128543. The next prime is 1355388128623. The reversal of 1355388128581 is 1858218835531.

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., 1318891464900 + 36496663681 = 1148430^2 + 191041^2 .

It is an emirp because it is prime and its reverse (1858218835531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1355388128581 - 2²¹ = 1355386031429 is a prime.

It is a super-2 number, since 2×1355388128581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1355388158581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677694064290 + 677694064291.

It is an arithmetic number, because the mean of its divisors is an integer number (677694064291).

Almost surely, 2^{1355388128581} is an apocalyptic number.

It is an amenable number.

1355388128581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1355388128581 is an equidigital number, since it uses as much as digits as its factorization.

1355388128581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216000, while the sum is 58.

The spelling of 1355388128581 in words is "one trillion, three hundred fifty-five billion, three hundred eighty-eight million, one hundred twenty-eight thousand, five hundred eighty-one".