1010991100 has 36 divisors (see below), whose sum is σ = 2507259664. Its totient is φ = 346625280.

The previous prime is 1010991061. The next prime is 1010991101. The reversal of 1010991100 is 11990101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010991101) 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, 721437 + ... + 722836.

Almost surely, 2^1010991100 is an apocalyptic number.

1010991100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1010991100 is an abundant number, since it is smaller than the sum of its proper divisors (1496268564).

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

1010991100 is a wasteful number, since it uses less digits than its factorization.

1010991100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444294 (or 1444287 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 22.

The square root of 1010991100 is about 31796.0862371456. The cubic root of 1010991100 is about 1003.6503586678.

Subtracting from 1010991100 its reverse (11990101), we obtain a palindrome (999000999).

The spelling of 1010991100 in words is "one billion, ten million, nine hundred ninety-one thousand, one hundred".