1156105385 has 4 divisors (see below), whose sum is σ = 1387326468. Its totient is φ = 924884304.

The previous prime is 1156105381. The next prime is 1156105393. The reversal of 1156105385 is 5835016511.

1156105385 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 299255401 + 856849984 = 17299^2 + 29272^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156105385 - 2² = 1156105381 is a prime.

It is a super-2 number, since 2×1156105385² = 2673159322451996450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156105381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115610534 + ... + 115610543.

It is an arithmetic number, because the mean of its divisors is an integer number (346831617).

Almost surely, 2^1156105385 is an apocalyptic number.

It is an amenable number.

1156105385 is a deficient number, since it is larger than the sum of its proper divisors (231221083).

1156105385 is an equidigital number, since it uses as much as digits as its factorization.

1156105385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231221082.

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 1156105385 is about 34001.5497440925. The cubic root of 1156105385 is about 1049.5403536150.

The spelling of 1156105385 in words is "one billion, one hundred fifty-six million, one hundred five thousand, three hundred eighty-five".