191356230 has 128 divisors (see below), whose sum is σ = 517104000. Its totient is φ = 45010944.

The previous prime is 191356229. The next prime is 191356237. The reversal of 191356230 is 32653191.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191356237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1284196 + ... + 1284344.

It is an arithmetic number, because the mean of its divisors is an integer number (4039875).

Almost surely, 2^191356230 is an apocalyptic number.

191356230 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 191356230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258552000).

191356230 is an abundant number, since it is smaller than the sum of its proper divisors (325747770).

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

191356230 is a wasteful number, since it uses less digits than its factorization.

191356230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 191356230 is about 13833.1569065055. The cubic root of 191356230 is about 576.2543304415.

The spelling of 191356230 in words is "one hundred ninety-one million, three hundred fifty-six thousand, two hundred thirty".