131006191 has 4 divisors (see below), whose sum is σ = 132303384. Its totient is φ = 129709000.

The previous prime is 131006143. The next prime is 131006209. The reversal of 131006191 is 191600131.

It is a happy number.

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 131006191 - 2¹⁹ = 130481903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131006791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648445 + ... + 648646.

It is an arithmetic number, because the mean of its divisors is an integer number (33075846).

Almost surely, 2^131006191 is an apocalyptic number.

131006191 is a deficient number, since it is larger than the sum of its proper divisors (1297193).

131006191 is a wasteful number, since it uses less digits than its factorization.

131006191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297192.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 131006191 is about 11445.7935941550. The cubic root of 131006191 is about 507.8833083387.

It can be divided in two parts, 13100 and 6191, that added together give a palindrome (19291).

The spelling of 131006191 in words is "one hundred thirty-one million, six thousand, one hundred ninety-one".