1161325550 has 48 divisors (see below), whose sum is σ = 2693077632. Its totient is φ = 361970400.

The previous prime is 1161325541. The next prime is 1161325577. The reversal of 1161325550 is 555231611.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146972 + ... + 154671.

It is an arithmetic number, because the mean of its divisors is an integer number (56105784).

Almost surely, 2^1161325550 is an apocalyptic number.

1161325550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1161325550 is an abundant number, since it is smaller than the sum of its proper divisors (1531752082).

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

1161325550 is a wasteful number, since it uses less digits than its factorization.

1161325550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301673 (or 301668 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 1161325550 is about 34078.2269198384. The cubic root of 1161325550 is about 1051.1176459069.

The spelling of 1161325550 in words is "one billion, one hundred sixty-one million, three hundred twenty-five thousand, five hundred fifty".