1162640561 has 4 divisors (see below), whose sum is σ = 1162719732. Its totient is φ = 1162561392.

The previous prime is 1162640519. The next prime is 1162640573. The reversal of 1162640561 is 1650462611.

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 325116961 + 837523600 = 18031^2 + 28940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1162640561 - 2⁶ = 1162640497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1162640581) 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, 10370 + ... + 49323.

It is an arithmetic number, because the mean of its divisors is an integer number (290679933).

Almost surely, 2^1162640561 is an apocalyptic number.

It is an amenable number.

1162640561 is a deficient number, since it is larger than the sum of its proper divisors (79171).

1162640561 is an equidigital number, since it uses as much as digits as its factorization.

1162640561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79170.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1162640561 is about 34097.5154666729. The cubic root of 1162640561 is about 1051.5142357858.

The spelling of 1162640561 in words is "one billion, one hundred sixty-two million, six hundred forty thousand, five hundred sixty-one".