1533140320981 has 2 divisors, whose sum is σ = 1533140320982. Its totient is φ = 1533140320980.

The previous prime is 1533140320913. The next prime is 1533140321029. The reversal of 1533140320981 is 1890230413351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1525397904900 + 7742416081 = 1235070^2 + 87991^2 .

It is a cyclic number.

It is not a de Polignac number, because 1533140320981 - 2¹⁷ = 1533140189909 is a prime.

It is a super-2 number, since 2×1533140320981² (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 (1533140321981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 766570160490 + 766570160491.

It is an arithmetic number, because the mean of its divisors is an integer number (766570160491).

Almost surely, 2^{1533140320981} is an apocalyptic number.

It is an amenable number.

1533140320981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1533140320981 is an equidigital number, since it uses as much as digits as its factorization.

1533140320981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 1533140320981 in words is "one trillion, five hundred thirty-three billion, one hundred forty million, three hundred twenty thousand, nine hundred eighty-one".