1161156560 has 20 divisors (see below), whose sum is σ = 2699689188. Its totient is φ = 464462592.

The previous prime is 1161156551. The next prime is 1161156569. The reversal of 1161156560 is 656511611.

It is an interprime number because it is at equal distance from previous prime (1161156551) and next prime (1161156569).

It can be written as a sum of positive squares in 2 ways, for example, as 253701184 + 907455376 = 15928^2 + 30124^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161156569) 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, 7257149 + ... + 7257308.

Almost surely, 2^1161156560 is an apocalyptic number.

1161156560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161156560 is an abundant number, since it is smaller than the sum of its proper divisors (1538532628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161156560 is a wasteful number, since it uses less digits than its factorization.

1161156560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14514470 (or 14514464 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 1161156560 is about 34075.7473872548. The cubic root of 1161156560 is about 1051.0666590590.

The spelling of 1161156560 in words is "one billion, one hundred sixty-one million, one hundred fifty-six thousand, five hundred sixty".