191810969250 has 128 divisors (see below), whose sum is σ = 492680537856. Its totient is φ = 49667904000.

The previous prime is 191810969221. The next prime is 191810969261. The reversal of 191810969250 is 52969018191.

It is a junction number, because it is equal to n+sod(n) for n = 191810969193 and 191810969202.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14451117 + ... + 14464383.

It is an arithmetic number, because the mean of its divisors is an integer number (3849066702).

Almost surely, 2^191810969250 is an apocalyptic number.

191810969250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 191810969250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246340268928).

191810969250 is an abundant number, since it is smaller than the sum of its proper divisors (300869568606).

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

191810969250 is a wasteful number, since it uses less digits than its factorization.

191810969250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13845 (or 13835 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 51.

The spelling of 191810969250 in words is "one hundred ninety-one billion, eight hundred ten million, nine hundred sixty-nine thousand, two hundred fifty".