1572871442581 has 2 divisors, whose sum is σ = 1572871442582. Its totient is φ = 1572871442580.

The previous prime is 1572871442573. The next prime is 1572871442599. The reversal of 1572871442581 is 1852441782751.

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., 1498433051025 + 74438391556 = 1224105^2 + 272834^2 .

It is a cyclic number.

It is not a de Polignac number, because 1572871442581 - 2³ = 1572871442573 is a prime.

It is a super-2 number, since 2×1572871442581² (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 (1572871442501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 786435721290 + 786435721291.

It is an arithmetic number, because the mean of its divisors is an integer number (786435721291).

Almost surely, 2^{1572871442581} is an apocalyptic number.

It is an amenable number.

1572871442581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1572871442581 is an equidigital number, since it uses as much as digits as its factorization.

1572871442581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5017600, while the sum is 55.

The spelling of 1572871442581 in words is "one trillion, five hundred seventy-two billion, eight hundred seventy-one million, four hundred forty-two thousand, five hundred eighty-one".