213131195 has 4 divisors (see below), whose sum is σ = 255757440. Its totient is φ = 170504952.

The previous prime is 213131173. The next prime is 213131197. The reversal of 213131195 is 591131312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213131195 - 2⁶ = 213131131 is a prime.

It is a super-3 number, since 3×213131195³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (213131197) 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 3 ways as a sum of consecutive naturals, for example, 21313115 + ... + 21313124.

It is an arithmetic number, because the mean of its divisors is an integer number (63939360).

Almost surely, 2^213131195 is an apocalyptic number.

213131195 is a deficient number, since it is larger than the sum of its proper divisors (42626245).

213131195 is an equidigital number, since it uses as much as digits as its factorization.

213131195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42626244.

The product of its digits is 810, while the sum is 26.

The square root of 213131195 is about 14599.0134940687. The cubic root of 213131195 is about 597.3318516355.

The spelling of 213131195 in words is "two hundred thirteen million, one hundred thirty-one thousand, one hundred ninety-five".