131209345 has 16 divisors (see below), whose sum is σ = 166308480. Its totient is φ = 99100800.

The previous prime is 131209277. The next prime is 131209367. The reversal of 131209345 is 543902131.

It is not a de Polignac number, because 131209345 - 2⁷ = 131209217 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 27325 + ... + 31765.

It is an arithmetic number, because the mean of its divisors is an integer number (10394280).

Almost surely, 2^131209345 is an apocalyptic number.

It is an amenable number.

131209345 is a deficient number, since it is larger than the sum of its proper divisors (35099135).

131209345 is a wasteful number, since it uses less digits than its factorization.

131209345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4776.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 131209345 is about 11454.6647703021. The cubic root of 131209345 is about 508.1457011235.

The spelling of 131209345 in words is "one hundred thirty-one million, two hundred nine thousand, three hundred forty-five".