1158220381 has 2 divisors, whose sum is σ = 1158220382. Its totient is φ = 1158220380.

The previous prime is 1158220379. The next prime is 1158220433. The reversal of 1158220381 is 1830228511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 963171225 + 195049156 = 31035^2 + 13966^2 .

It is an emirp because it is prime and its reverse (1830228511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1158220381 - 2¹ = 1158220379 is a prime.

It is a super-2 number, since 2×1158220381² = 2682948901927570322, which contains 22 as substring.

Together with 1158220379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1158220321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 579110190 + 579110191.

It is an arithmetic number, because the mean of its divisors is an integer number (579110191).

Almost surely, 2^1158220381 is an apocalyptic number.

It is an amenable number.

1158220381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1158220381 is an equidigital number, since it uses as much as digits as its factorization.

1158220381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 1158220381 is about 34032.6369974470. The cubic root of 1158220381 is about 1050.1799785211.

Adding to 1158220381 its reverse (1830228511), we get a palindrome (2988448892).

The spelling of 1158220381 in words is "one billion, one hundred fifty-eight million, two hundred twenty thousand, three hundred eighty-one".