1161297000 has 320 divisors, whose sum is σ = 4145169600. Its totient is φ = 304430400.

The previous prime is 1161296989. The next prime is 1161297029. The reversal of 1161297000 is 7921611.

It is a super-2 number, since 2×1161297000² = 2697221444418000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 79 ways as a sum of consecutive naturals, for example, 19682971 + ... + 19683029.

It is an arithmetic number, because the mean of its divisors is an integer number (12953655).

Almost surely, 2^1161297000 is an apocalyptic number.

1161297000 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 1161297000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2072584800).

1161297000 is an abundant number, since it is smaller than the sum of its proper divisors (2983872600).

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

1161297000 is an frugal number, since it uses more digits than its factorization.

1161297000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 1161297000 is about 34077.8080280995. The cubic root of 1161297000 is about 1051.1090322858.

The spelling of 1161297000 in words is "one billion, one hundred sixty-one million, two hundred ninety-seven thousand".