131388806 has 4 divisors (see below), whose sum is σ = 197083212. Its totient is φ = 65694402.

The previous prime is 131388793. The next prime is 131388827. The reversal of 131388806 is 608883131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 608883131 = 6599 ⋅92269.

It is a self number, because there is not a number n which added to its sum of digits gives 131388806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32847200 + ... + 32847203.

It is an arithmetic number, because the mean of its divisors is an integer number (49270803).

Almost surely, 2^131388806 is an apocalyptic number.

131388806 is a deficient number, since it is larger than the sum of its proper divisors (65694406).

131388806 is an equidigital number, since it uses as much as digits as its factorization.

131388806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65694405.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 131388806 is about 11462.4956270439. The cubic root of 131388806 is about 508.3772669246.

The spelling of 131388806 in words is "one hundred thirty-one million, three hundred eighty-eight thousand, eight hundred six".