1190553561 has 12 divisors (see below), whose sum is σ = 1724114340. Its totient is φ = 791659680.

The previous prime is 1190553557. The next prime is 1190553563. The reversal of 1190553561 is 1653550911.

1190553561 is a `hidden beast` number, since 1 + 1 + 90 + 5 + 5 + 3 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 791353161 + 399200400 = 28131^2 + 19980^2 .

It is not a de Polignac number, because 1190553561 - 2² = 1190553557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1190553563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166530 + ... + 173531.

It is an arithmetic number, because the mean of its divisors is an integer number (143676195).

Almost surely, 2^1190553561 is an apocalyptic number.

It is an amenable number.

1190553561 is a deficient number, since it is larger than the sum of its proper divisors (533560779).

1190553561 is a wasteful number, since it uses less digits than its factorization.

1190553561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340456 (or 340453 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 36.

The square root of 1190553561 is about 34504.3991543107. The cubic root of 1190553561 is about 1059.8627925526.

The spelling of 1190553561 in words is "one billion, one hundred ninety million, five hundred fifty-three thousand, five hundred sixty-one".