1160561221 has 4 divisors (see below), whose sum is σ = 1160635500. Its totient is φ = 1160486944.

The previous prime is 1160561201. The next prime is 1160561231. The reversal of 1160561221 is 1221650611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 714760225 + 445800996 = 26735^2 + 21114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1160561221 - 2²³ = 1152172613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1160561201) 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, 3616 + ... + 48313.

It is an arithmetic number, because the mean of its divisors is an integer number (290158875).

Almost surely, 2^1160561221 is an apocalyptic number.

It is an amenable number.

1160561221 is a deficient number, since it is larger than the sum of its proper divisors (74279).

1160561221 is an equidigital number, since it uses as much as digits as its factorization.

1160561221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74278.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1160561221 is about 34067.0107435331. The cubic root of 1160561221 is about 1050.8869968247.

The spelling of 1160561221 in words is "one billion, one hundred sixty million, five hundred sixty-one thousand, two hundred twenty-one".