191910010100 has 18 divisors (see below), whose sum is σ = 416444722134. Its totient is φ = 76764004000.

The previous prime is 191910010099. The next prime is 191910010121. The reversal of 191910010100 is 1010019191.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2613663376 + 189296346724 = 51124^2 + 435082^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 959549951 + ... + 959550150.

Almost surely, 2^191910010100 is an apocalyptic number.

191910010100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191910010100 is an abundant number, since it is smaller than the sum of its proper divisors (224534712034).

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

191910010100 is a wasteful number, since it uses less digits than its factorization.

191910010100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919100115 (or 1919100108 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 23.

Adding to 191910010100 its reverse (1010019191), we get a palindrome (192920029291).

The spelling of 191910010100 in words is "one hundred ninety-one billion, nine hundred ten million, ten thousand, one hundred".