131871945 has 16 divisors (see below), whose sum is σ = 213887232. Its totient is φ = 69367680.

The previous prime is 131871937. The next prime is 131871947. The reversal of 131871945 is 549178131.

It is not a de Polignac number, because 131871945 - 2³ = 131871937 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131871947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59121 + ... + 61310.

It is an arithmetic number, because the mean of its divisors is an integer number (13367952).

Almost surely, 2^131871945 is an apocalyptic number.

131871945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131871945 is a deficient number, since it is larger than the sum of its proper divisors (82015287).

131871945 is a wasteful number, since it uses less digits than its factorization.

131871945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120512.

The product of its digits is 30240, while the sum is 39.

The square root of 131871945 is about 11483.5510622803. The cubic root of 131871945 is about 508.9996346056. Note that the first 3 decimals are identical.

The spelling of 131871945 in words is "one hundred thirty-one million, eight hundred seventy-one thousand, nine hundred forty-five".