1145057521981 has 2 divisors, whose sum is σ = 1145057521982. Its totient is φ = 1145057521980.

The previous prime is 1145057521969. The next prime is 1145057522003. The reversal of 1145057521981 is 1891257505411.

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., 1085886959481 + 59170562500 = 1042059^2 + 243250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145057521981 - 2²⁷ = 1144923304253 is a prime.

It is a super-2 number, since 2×1145057521981² (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 (1145057521381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572528760990 + 572528760991.

It is an arithmetic number, because the mean of its divisors is an integer number (572528760991).

Almost surely, 2^{1145057521981} is an apocalyptic number.

It is an amenable number.

1145057521981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145057521981 is an equidigital number, since it uses as much as digits as its factorization.

1145057521981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504000, while the sum is 49.

The spelling of 1145057521981 in words is "one trillion, one hundred forty-five billion, fifty-seven million, five hundred twenty-one thousand, nine hundred eighty-one".