131891217 has 32 divisors (see below), whose sum is σ = 194294400. Its totient is φ = 79252992.

The previous prime is 131891209. The next prime is 131891231. The reversal of 131891217 is 712198131.

It is not a de Polignac number, because 131891217 - 2³ = 131891209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131891257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120123 + ... + 121215.

It is an arithmetic number, because the mean of its divisors is an integer number (6071700).

Almost surely, 2^131891217 is an apocalyptic number.

It is an amenable number.

131891217 is a deficient number, since it is larger than the sum of its proper divisors (62403183).

131891217 is a wasteful number, since it uses less digits than its factorization.

131891217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217.

The product of its digits is 3024, while the sum is 33.

The square root of 131891217 is about 11484.3901448880. The cubic root of 131891217 is about 509.0244287677.

The spelling of 131891217 in words is "one hundred thirty-one million, eight hundred ninety-one thousand, two hundred seventeen".