1156600561 has 4 divisors (see below), whose sum is σ = 1156672000. Its totient is φ = 1156529124.

The previous prime is 1156600531. The next prime is 1156600573. The reversal of 1156600561 is 1650066511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1156600561 - 2¹³ = 1156592369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156600531) 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, 1480 + ... + 48118.

It is an arithmetic number, because the mean of its divisors is an integer number (289168000).

Almost surely, 2^1156600561 is an apocalyptic number.

It is an amenable number.

1156600561 is a deficient number, since it is larger than the sum of its proper divisors (71439).

1156600561 is an equidigital number, since it uses as much as digits as its factorization.

1156600561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71438.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1156600561 is about 34008.8306326460. The cubic root of 1156600561 is about 1049.6901764654.

The spelling of 1156600561 in words is "one billion, one hundred fifty-six million, six hundred thousand, five hundred sixty-one".