199131870 has 32 divisors (see below), whose sum is σ = 546190848. Its totient is φ = 45515808.

The previous prime is 199131869. The next prime is 199131871. The reversal of 199131870 is 78131991.

It is an interprime number because it is at equal distance from previous prime (199131869) and next prime (199131871).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199131871) 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 15 ways as a sum of consecutive naturals, for example, 473914 + ... + 474333.

It is an arithmetic number, because the mean of its divisors is an integer number (17068464).

Almost surely, 2^199131870 is an apocalyptic number.

199131870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199131870 is an abundant number, since it is smaller than the sum of its proper divisors (347058978).

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

199131870 is a wasteful number, since it uses less digits than its factorization.

199131870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948264.

The product of its (nonzero) digits is 13608, while the sum is 39.

The square root of 199131870 is about 14111.4092138241. The cubic root of 199131870 is about 583.9561779059.

The spelling of 199131870 in words is "one hundred ninety-nine million, one hundred thirty-one thousand, eight hundred seventy".