1528243199981 has 2 divisors, whose sum is σ = 1528243199982. Its totient is φ = 1528243199980.

The previous prime is 1528243199927. The next prime is 1528243200017. The reversal of 1528243199981 is 1899913428251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1087202436100 + 441040763881 = 1042690^2 + 664109^2 .

It is a cyclic number.

It is not a de Polignac number, because 1528243199981 - 2²² = 1528239005677 is a prime.

It is a super-2 number, since 2×1528243199981² (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 (1528243199081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 764121599990 + 764121599991.

It is an arithmetic number, because the mean of its divisors is an integer number (764121599991).

Almost surely, 2^{1528243199981} is an apocalyptic number.

It is an amenable number.

1528243199981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1528243199981 is an equidigital number, since it uses as much as digits as its factorization.

1528243199981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11197440, while the sum is 62.

The spelling of 1528243199981 in words is "one trillion, five hundred twenty-eight billion, two hundred forty-three million, one hundred ninety-nine thousand, nine hundred eighty-one".