131871785 has 16 divisors (see below), whose sum is σ = 164868480. Its totient is φ = 101170560.

The previous prime is 131871767. The next prime is 131871821. The reversal of 131871785 is 587178131.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-131871785 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6644 + ... + 17546.

It is an arithmetic number, because the mean of its divisors is an integer number (10304280).

Almost surely, 2^131871785 is an apocalyptic number.

It is an amenable number.

131871785 is a deficient number, since it is larger than the sum of its proper divisors (32996695).

131871785 is a wasteful number, since it uses less digits than its factorization.

131871785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11008.

The product of its digits is 47040, while the sum is 41.

The square root of 131871785 is about 11483.5440957920. The cubic root of 131871785 is about 508.9994287494. Note that the first 3 decimals are identical.

The spelling of 131871785 in words is "one hundred thirty-one million, eight hundred seventy-one thousand, seven hundred eighty-five".