131640231 has 8 divisors (see below), whose sum is σ = 185845104. Its totient is φ = 82597760.

The previous prime is 131640211. The next prime is 131640233. The reversal of 131640231 is 132046131.

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 131640231 - 2¹⁸ = 131378087 is a prime.

It is a super-2 number, since 2×131640231² = 34658300835466722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131640198 and 131640207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131640233) 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 7 ways as a sum of consecutive naturals, for example, 1290540 + ... + 1290641.

It is an arithmetic number, because the mean of its divisors is an integer number (23230638).

Almost surely, 2^131640231 is an apocalyptic number.

131640231 is a deficient number, since it is larger than the sum of its proper divisors (54204873).

131640231 is a wasteful number, since it uses less digits than its factorization.

131640231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581201.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 131640231 is about 11473.4576741277. The cubic root of 131640231 is about 508.7013364139.

Adding to 131640231 its reverse (132046131), we get a palindrome (263686362).

The spelling of 131640231 in words is "one hundred thirty-one million, six hundred forty thousand, two hundred thirty-one".