191047290 has 64 divisors (see below), whose sum is σ = 536820480. Its totient is φ = 42600960.

The previous prime is 191047277. The next prime is 191047301. The reversal of 191047290 is 92740191.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2485 + ... + 19704.

It is an arithmetic number, because the mean of its divisors is an integer number (8387820).

Almost surely, 2^191047290 is an apocalyptic number.

191047290 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 191047290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268410240).

191047290 is an abundant number, since it is smaller than the sum of its proper divisors (345773190).

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

191047290 is a wasteful number, since it uses less digits than its factorization.

191047290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22247.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 191047290 is about 13821.9857473519. The cubic root of 191047290 is about 575.9440471787.

The spelling of 191047290 in words is "one hundred ninety-one million, forty-seven thousand, two hundred ninety".