131145631 has 4 divisors (see below), whose sum is σ = 131733952. Its totient is φ = 130557312.

The previous prime is 131145629. The next prime is 131145643. The reversal of 131145631 is 136541131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136541131 = 193 ⋅707467.

It is a cyclic number.

It is not a de Polignac number, because 131145631 - 2¹ = 131145629 is a prime.

It is a super-2 number, since 2×131145631² = 34398353060776322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131145596 and 131145605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131145671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293826 + ... + 294271.

It is an arithmetic number, because the mean of its divisors is an integer number (32933488).

Almost surely, 2^131145631 is an apocalyptic number.

131145631 is a deficient number, since it is larger than the sum of its proper divisors (588321).

131145631 is an equidigital number, since it uses as much as digits as its factorization.

131145631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588320.

The product of its digits is 1080, while the sum is 25.

The square root of 131145631 is about 11451.8832948996. The cubic root of 131145631 is about 508.0634375797.

Adding to 131145631 its reverse (136541131), we get a palindrome (267686762).

The spelling of 131145631 in words is "one hundred thirty-one million, one hundred forty-five thousand, six hundred thirty-one".