1158353587981 has 2 divisors, whose sum is σ = 1158353587982. Its totient is φ = 1158353587980.

The previous prime is 1158353587949. The next prime is 1158353587997. The reversal of 1158353587981 is 1897853538511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 757145359881 + 401208228100 = 870141^2 + 633410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1158353587981 - 2⁵ = 1158353587949 is a prime.

It is a super-2 number, since 2×1158353587981² (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 (1158353587081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 579176793990 + 579176793991.

It is an arithmetic number, because the mean of its divisors is an integer number (579176793991).

Almost surely, 2^{1158353587981} is an apocalyptic number.

It is an amenable number.

1158353587981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1158353587981 is an equidigital number, since it uses as much as digits as its factorization.

1158353587981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288000, while the sum is 64.

The spelling of 1158353587981 in words is "one trillion, one hundred fifty-eight billion, three hundred fifty-three million, five hundred eighty-seven thousand, nine hundred eighty-one".