131225641 has 4 divisors (see below), whose sum is σ = 132106500. Its totient is φ = 130344784.

The previous prime is 131225639. The next prime is 131225651. The reversal of 131225641 is 146522131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146522131 = 7 ⋅20931733.

It can be written as a sum of positive squares in 2 ways, for example, as 63920025 + 67305616 = 7995^2 + 8204^2 .

It is a cyclic number.

It is not a de Polignac number, because 131225641 - 2¹ = 131225639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131225651) 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 3 ways as a sum of consecutive naturals, for example, 440206 + ... + 440503.

It is an arithmetic number, because the mean of its divisors is an integer number (33026625).

Almost surely, 2^131225641 is an apocalyptic number.

It is an amenable number.

131225641 is a deficient number, since it is larger than the sum of its proper divisors (880859).

131225641 is an equidigital number, since it uses as much as digits as its factorization.

131225641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880858.

The product of its digits is 1440, while the sum is 25.

The square root of 131225641 is about 11455.3760741409. The cubic root of 131225641 is about 508.1667372256.

Adding to 131225641 its reverse (146522131), we get a palindrome (277747772).

The spelling of 131225641 in words is "one hundred thirty-one million, two hundred twenty-five thousand, six hundred forty-one".