131640446 has 64 divisors (see below), whose sum is σ = 243855360. Its totient is φ = 52116480.

The previous prime is 131640437. The next prime is 131640449. The reversal of 131640446 is 644046131.

It is a super-3 number, since 3×131640446³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131640449) 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 31 ways as a sum of consecutive naturals, for example, 1357070 + ... + 1357166.

It is an arithmetic number, because the mean of its divisors is an integer number (3810240).

Almost surely, 2^131640446 is an apocalyptic number.

131640446 is a deficient number, since it is larger than the sum of its proper divisors (112214914).

131640446 is a wasteful number, since it uses less digits than its factorization.

131640446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 131640446 is about 11473.4670435749. The cubic root of 131640446 is about 508.7016133574.

Adding to 131640446 its reverse (644046131), we get a palindrome (775686577).

The spelling of 131640446 in words is "one hundred thirty-one million, six hundred forty thousand, four hundred forty-six".