1155111649 has 4 divisors (see below), whose sum is σ = 1166548500. Its totient is φ = 1143674800.

The previous prime is 1155111641. The next prime is 1155111653. The reversal of 1155111649 is 9461115511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9461115511 = 101 ⋅93674411.

It can be written as a sum of positive squares in 2 ways, for example, as 1034265600 + 120846049 = 32160^2 + 10993^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155111649 - 2³ = 1155111641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155111641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5718274 + ... + 5718475.

It is an arithmetic number, because the mean of its divisors is an integer number (291637125).

Almost surely, 2^1155111649 is an apocalyptic number.

It is an amenable number.

1155111649 is a deficient number, since it is larger than the sum of its proper divisors (11436851).

1155111649 is a wasteful number, since it uses less digits than its factorization.

1155111649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11436850.

The product of its digits is 5400, while the sum is 34.

The square root of 1155111649 is about 33986.9335039218. The cubic root of 1155111649 is about 1049.2395549110.

The spelling of 1155111649 in words is "one billion, one hundred fifty-five million, one hundred eleven thousand, six hundred forty-nine".