1155916785 has 16 divisors (see below), whose sum is σ = 1958259456. Its totient is φ = 580224768.

The previous prime is 1155916759. The next prime is 1155916787. The reversal of 1155916785 is 5876195511.

It is not a de Polignac number, because 1155916785 - 2⁶ = 1155916721 is a prime.

It is a super-2 number, since 2×1155916785² = 2672287227689472450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1155916787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2266249 + ... + 2266758.

It is an arithmetic number, because the mean of its divisors is an integer number (122391216).

Almost surely, 2^1155916785 is an apocalyptic number.

1155916785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1155916785 is a deficient number, since it is larger than the sum of its proper divisors (802342671).

1155916785 is a wasteful number, since it uses less digits than its factorization.

1155916785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4533032.

The product of its digits is 378000, while the sum is 48.

The square root of 1155916785 is about 33998.7762279762. The cubic root of 1155916785 is about 1049.4832786349.

The spelling of 1155916785 in words is "one billion, one hundred fifty-five million, nine hundred sixteen thousand, seven hundred eighty-five".