131367721 has 8 divisors (see below), whose sum is σ = 139203360. Its totient is φ = 123544128.

The previous prime is 131367713. The next prime is 131367799. The reversal of 131367721 is 127763131.

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 131367721 - 2³ = 131367713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131367701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29670 + ... + 33808.

It is an arithmetic number, because the mean of its divisors is an integer number (17400420).

Almost surely, 2^131367721 is an apocalyptic number.

It is an amenable number.

131367721 is a deficient number, since it is larger than the sum of its proper divisors (7835639).

131367721 is a wasteful number, since it uses less digits than its factorization.

131367721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6023.

The product of its digits is 5292, while the sum is 31.

The square root of 131367721 is about 11461.5758515136. The cubic root of 131367721 is about 508.3500710306.

The spelling of 131367721 in words is "one hundred thirty-one million, three hundred sixty-seven thousand, seven hundred twenty-one".