1161266100 has 72 divisors (see below), whose sum is σ = 3370805088. Its totient is φ = 308668800.

The previous prime is 1161266087. The next prime is 1161266101. The reversal of 1161266100 is 16621611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161266101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88995 + ... + 101205.

Almost surely, 2^1161266100 is an apocalyptic number.

1161266100 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 1161266100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1685402544).

1161266100 is an abundant number, since it is smaller than the sum of its proper divisors (2209538988).

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

1161266100 is a wasteful number, since it uses less digits than its factorization.

1161266100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12545 (or 12538 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1161266100 is about 34077.3546508528. The cubic root of 1161266100 is about 1051.0997095035.

Adding to 1161266100 its reverse (16621611), we get a palindrome (1177887711).

The spelling of 1161266100 in words is "one billion, one hundred sixty-one million, two hundred sixty-six thousand, one hundred".