1161275000 has 48 divisors (see below), whose sum is σ = 2721622680. Its totient is φ = 464500000.

The previous prime is 1161274999. The next prime is 1161275039. The reversal of 1161275000 is 5721611.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1775 + ... + 48225.

Almost surely, 2^1161275000 is an apocalyptic number.

1161275000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1161275000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1360811340).

1161275000 is an abundant number, since it is smaller than the sum of its proper divisors (1560347680).

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

1161275000 is an frugal number, since it uses more digits than its factorization.

1161275000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46482 (or 46458 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 1161275000 is about 34077.4852358562. The cubic root of 1161275000 is about 1051.1023947231.

Adding to 1161275000 its reverse (5721611), we get a palindrome (1166996611).

The spelling of 1161275000 in words is "one billion, one hundred sixty-one million, two hundred seventy-five thousand".