191231130 has 64 divisors (see below), whose sum is σ = 488177280. Its totient is φ = 47775744.

The previous prime is 191231123. The next prime is 191231137. The reversal of 191231130 is 31132191.

It is an interprime number because it is at equal distance from previous prime (191231123) and next prime (191231137).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 191231097 and 191231106.

It is not an unprimeable number, because it can be changed into a prime (191231137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130341 + ... + 131799.

It is an arithmetic number, because the mean of its divisors is an integer number (7627770).

Almost surely, 2^191231130 is an apocalyptic number.

191231130 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 191231130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244088640).

191231130 is an abundant number, since it is smaller than the sum of its proper divisors (296946150).

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

191231130 is a wasteful number, since it uses less digits than its factorization.

191231130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 191231130 is about 13828.6344228199. The cubic root of 191231130 is about 576.1287267754.

The spelling of 191231130 in words is "one hundred ninety-one million, two hundred thirty-one thousand, one hundred thirty".