131891806 has 8 divisors (see below), whose sum is σ = 208250280. Its totient is φ = 62475048.

The previous prime is 131891779. The next prime is 131891813. The reversal of 131891806 is 608198131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1735381 + ... + 1735456.

It is an arithmetic number, because the mean of its divisors is an integer number (26031285).

Almost surely, 2^131891806 is an apocalyptic number.

131891806 is a deficient number, since it is larger than the sum of its proper divisors (76358474).

131891806 is a wasteful number, since it uses less digits than its factorization.

131891806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470858.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 131891806 is about 11484.4157883629. The cubic root of 131891806 is about 509.0251865006.

The spelling of 131891806 in words is "one hundred thirty-one million, eight hundred ninety-one thousand, eight hundred six".