131172872729 has 16 divisors (see below), whose sum is σ = 140827832208. Its totient is φ = 121742548992.

The previous prime is 131172872723. The next prime is 131172872773. The reversal of 131172872729 is 927278271131.

It can be written as a sum of positive squares in 8 ways, for example, as 8977183504 + 122195689225 = 94748^2 + 349565^2 .

It is a cyclic number.

It is not a de Polignac number, because 131172872729 - 2⁴ = 131172872713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131172872723) 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, 313187 + ... + 600359.

It is an arithmetic number, because the mean of its divisors is an integer number (8801739513).

Almost surely, 2^131172872729 is an apocalyptic number.

It is an amenable number.

131172872729 is a deficient number, since it is larger than the sum of its proper divisors (9654959479).

131172872729 is a wasteful number, since it uses less digits than its factorization.

131172872729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287564.

The product of its digits is 592704, while the sum is 50.

The spelling of 131172872729 in words is "one hundred thirty-one billion, one hundred seventy-two million, eight hundred seventy-two thousand, seven hundred twenty-nine".