1153042661 has 4 divisors (see below), whose sum is σ = 1154043852. Its totient is φ = 1152041472.

The previous prime is 1153042651. The next prime is 1153042703. The reversal of 1153042661 is 1662403511.

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: 1662403511 = 29 ⋅57324259.

It can be written as a sum of positive squares in 2 ways, for example, as 1000520161 + 152522500 = 31631^2 + 12350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1153042661 is a prime.

It is a Duffinian number.

1153042661 is a modest number, since divided by 42661 gives 1153 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1153042651) 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, 498866 + ... + 501171.

It is an arithmetic number, because the mean of its divisors is an integer number (288510963).

Almost surely, 2^1153042661 is an apocalyptic number.

It is an amenable number.

1153042661 is a deficient number, since it is larger than the sum of its proper divisors (1001191).

1153042661 is a wasteful number, since it uses less digits than its factorization.

1153042661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001190.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1153042661 is about 33956.4818701820. The cubic root of 1153042661 is about 1048.6127290793.

The spelling of 1153042661 in words is "one billion, one hundred fifty-three million, forty-two thousand, six hundred sixty-one".