131752721 has 8 divisors (see below), whose sum is σ = 136034304. Its totient is φ = 127522080.

The previous prime is 131752711. The next prime is 131752727. The reversal of 131752721 is 127257131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131752721 - 2⁶ = 131752657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131752727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7445 + ... + 17858.

It is an arithmetic number, because the mean of its divisors is an integer number (17004288).

Almost surely, 2^131752721 is an apocalyptic number.

It is an amenable number.

131752721 is a deficient number, since it is larger than the sum of its proper divisors (4281583).

131752721 is a wasteful number, since it uses less digits than its factorization.

131752721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25471.

The product of its digits is 2940, while the sum is 29.

The square root of 131752721 is about 11478.3588112587. The cubic root of 131752721 is about 508.8461946660.

The spelling of 131752721 in words is "one hundred thirty-one million, seven hundred fifty-two thousand, seven hundred twenty-one".