191009780106 has 32 divisors (see below), whose sum is σ = 404764371648. Its totient is φ = 59884181760.

The previous prime is 191009780083. The next prime is 191009780107. The reversal of 191009780106 is 601087900191.

It is a super-2 number, since 2×191009780106² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (191009780107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 480105 + ... + 782636.

It is an arithmetic number, because the mean of its divisors is an integer number (12648886614).

Almost surely, 2^191009780106 is an apocalyptic number.

191009780106 is an abundant number, since it is smaller than the sum of its proper divisors (213754591542).

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

191009780106 is a wasteful number, since it uses less digits than its factorization.

191009780106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264246.

The product of its (nonzero) digits is 27216, while the sum is 42.

The spelling of 191009780106 in words is "one hundred ninety-one billion, nine million, seven hundred eighty thousand, one hundred six".