1152550561 has 4 divisors (see below), whose sum is σ = 1174296852. Its totient is φ = 1130804272.

The previous prime is 1152550541. The next prime is 1152550571. The reversal of 1152550561 is 1650552511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1650552511 = 397 ⋅4157563.

It can be written as a sum of positive squares in 2 ways, for example, as 1045552225 + 106998336 = 32335^2 + 10344^2 .

It is a cyclic number.

It is not a de Polignac number, because 1152550561 - 2¹⁹ = 1152026273 is a prime.

It is a super-2 number, since 2×1152550561² = 2656745591322829442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1152550501) 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, 10873066 + ... + 10873171.

It is an arithmetic number, because the mean of its divisors is an integer number (293574213).

Almost surely, 2^1152550561 is an apocalyptic number.

It is an amenable number.

1152550561 is a deficient number, since it is larger than the sum of its proper divisors (21746291).

1152550561 is an equidigital number, since it uses as much as digits as its factorization.

1152550561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21746290.

The product of its (nonzero) digits is 7500, while the sum is 31.

The square root of 1152550561 is about 33949.2350576563. The cubic root of 1152550561 is about 1048.4635308554.

The spelling of 1152550561 in words is "one billion, one hundred fifty-two million, five hundred fifty thousand, five hundred sixty-one".