131203640 has 32 divisors (see below), whose sum is σ = 296380080. Its totient is φ = 52273152.

The previous prime is 131203613. The next prime is 131203651. The reversal of 131203640 is 46302131.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3899 + ... + 16661.

Almost surely, 2^131203640 is an apocalyptic number.

131203640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131203640 is an abundant number, since it is smaller than the sum of its proper divisors (165176440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131203640 is a wasteful number, since it uses less digits than its factorization.

131203640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13031 (or 13027 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 131203640 is about 11454.4157424113. The cubic root of 131203640 is about 508.1383362689.

Adding to 131203640 its reverse (46302131), we get a palindrome (177505771).

The spelling of 131203640 in words is "one hundred thirty-one million, two hundred three thousand, six hundred forty".