1157576561 has 4 divisors (see below), whose sum is σ = 1188862452. Its totient is φ = 1126290672.

The previous prime is 1157576533. The next prime is 1157576569. The reversal of 1157576561 is 1656757511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1656757511 = 421 ⋅3935291.

It can be written as a sum of positive squares in 2 ways, for example, as 913248400 + 244328161 = 30220^2 + 15631^2 .

It is a cyclic number.

It is not a de Polignac number, because 1157576561 - 2¹⁰ = 1157575537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (1157576569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15642890 + ... + 15642963.

It is an arithmetic number, because the mean of its divisors is an integer number (297215613).

Almost surely, 2^1157576561 is an apocalyptic number.

It is an amenable number.

1157576561 is a deficient number, since it is larger than the sum of its proper divisors (31285891).

1157576561 is an equidigital number, since it uses as much as digits as its factorization.

1157576561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31285890.

The product of its digits is 220500, while the sum is 44.

The square root of 1157576561 is about 34023.1768211024. The cubic root of 1157576561 is about 1049.9853545954.

The spelling of 1157576561 in words is "one billion, one hundred fifty-seven million, five hundred seventy-six thousand, five hundred sixty-one".