131891211 has 24 divisors (see below), whose sum is σ = 196148160. Its totient is φ = 85363200.

The previous prime is 131891209. The next prime is 131891231. The reversal of 131891211 is 112198131.

It is not a de Polignac number, because 131891211 - 2¹ = 131891209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131891231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41851 + ... + 44891.

It is an arithmetic number, because the mean of its divisors is an integer number (8172840).

Almost surely, 2^131891211 is an apocalyptic number.

131891211 is a deficient number, since it is larger than the sum of its proper divisors (64256949).

131891211 is a wasteful number, since it uses less digits than its factorization.

131891211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187 (or 3184 counting only the distinct ones).

The product of its digits is 432, while the sum is 27.

The square root of 131891211 is about 11484.3898836638. The cubic root of 131891211 is about 509.0244210489.

It can be divided in two parts, 13189 and 1211, that added together give a square (14400 = 120²).

The spelling of 131891211 in words is "one hundred thirty-one million, eight hundred ninety-one thousand, two hundred eleven".