191023560 has 480 divisors, whose sum is σ = 825846840. Its totient is φ = 37933056.

The previous prime is 191023559. The next prime is 191023571. The reversal of 191023560 is 65320191.

It can be written as a sum of positive squares in 4 ways, for example, as 145298916 + 45724644 = 12054^2 + 6762^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 11236672 + ... + 11236688.

Almost surely, 2^191023560 is an apocalyptic number.

191023560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191023560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412923420).

191023560 is an abundant number, since it is smaller than the sum of its proper divisors (634823280).

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

191023560 is a wasteful number, since it uses less digits than its factorization.

191023560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 191023560 is about 13821.1273056868. The cubic root of 191023560 is about 575.9202001718.

The spelling of 191023560 in words is "one hundred ninety-one million, twenty-three thousand, five hundred sixty".