191031240 has 32 divisors (see below), whose sum is σ = 573094080. Its totient is φ = 50941632.

The previous prime is 191031179. The next prime is 191031277. The reversal of 191031240 is 42130191.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 795844 + ... + 796083.

It is an arithmetic number, because the mean of its divisors is an integer number (17909190).

Almost surely, 2^191031240 is an apocalyptic number.

191031240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191031240 is an abundant number, since it is smaller than the sum of its proper divisors (382062840).

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

191031240 is a wasteful number, since it uses less digits than its factorization.

191031240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591941 (or 1591937 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 191031240 is about 13821.4051384076. The cubic root of 191031240 is about 575.9279182562.

It can be divided in two parts, 191031 and 240, that added together give a triangular number (191271 = T₆₁₈).

The spelling of 191031240 in words is "one hundred ninety-one million, thirty-one thousand, two hundred forty".