1155571011 has 24 divisors (see below), whose sum is σ = 1908507744. Its totient is φ = 660015360.

The previous prime is 1155571009. The next prime is 1155571049. The reversal of 1155571011 is 1101755511.

It is a happy number.

1155571011 is a `hidden beast` number, since 1 + 1 + 5 + 557 + 101 + 1 = 666.

It is not a de Polignac number, because 1155571011 - 2¹ = 1155571009 is a prime.

It is a super-2 number, since 2×1155571011² = 2670688722927124242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1155571061) 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 23 ways as a sum of consecutive naturals, for example, 234505 + ... + 239381.

It is an arithmetic number, because the mean of its divisors is an integer number (79521156).

Almost surely, 2^1155571011 is an apocalyptic number.

1155571011 is a deficient number, since it is larger than the sum of its proper divisors (752936733).

1155571011 is a wasteful number, since it uses less digits than its factorization.

1155571011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8651 (or 8648 counting only the distinct ones).

The product of its (nonzero) digits is 875, while the sum is 27.

The square root of 1155571011 is about 33993.6907528441. The cubic root of 1155571011 is about 1049.3786228253.

The spelling of 1155571011 in words is "one billion, one hundred fifty-five million, five hundred seventy-one thousand, eleven".