1155561071 has 12 divisors (see below), whose sum is σ = 1353902760. Its totient is φ = 983349360.

The previous prime is 1155561049. The next prime is 1155561089. The reversal of 1155561071 is 1701655511.

It is a de Polignac number, because none of the positive numbers 2^k-1155561071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155561031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78020 + ... + 91641.

It is an arithmetic number, because the mean of its divisors is an integer number (112825230).

Almost surely, 2^1155561071 is an apocalyptic number.

1155561071 is a deficient number, since it is larger than the sum of its proper divisors (198341689).

1155561071 is a wasteful number, since it uses less digits than its factorization.

1155561071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169814 (or 169807 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 32.

The square root of 1155561071 is about 33993.5445489287. The cubic root of 1155561071 is about 1049.3756139655.

The spelling of 1155561071 in words is "one billion, one hundred fifty-five million, five hundred sixty-one thousand, seventy-one".