131725121 has 4 divisors (see below), whose sum is σ = 143700144. Its totient is φ = 119750100.

The previous prime is 131725063. The next prime is 131725123. The reversal of 131725121 is 121527131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121527131 = 11 ⋅11047921.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131725121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131725123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5987495 + ... + 5987516.

It is an arithmetic number, because the mean of its divisors is an integer number (35925036).

Almost surely, 2^131725121 is an apocalyptic number.

131725121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131725121 is a deficient number, since it is larger than the sum of its proper divisors (11975023).

131725121 is a wasteful number, since it uses less digits than its factorization.

131725121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11975022.

The product of its digits is 420, while the sum is 23.

The square root of 131725121 is about 11477.1564858200. The cubic root of 131725121 is about 508.8106605846.

The spelling of 131725121 in words is "one hundred thirty-one million, seven hundred twenty-five thousand, one hundred twenty-one".