131312638 has 16 divisors (see below), whose sum is σ = 204482880. Its totient is φ = 63167776.

The previous prime is 131312617. The next prime is 131312639. The reversal of 131312638 is 836213131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131312639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13131 + ... + 20857.

It is an arithmetic number, because the mean of its divisors is an integer number (12780180).

Almost surely, 2^131312638 is an apocalyptic number.

131312638 is a deficient number, since it is larger than the sum of its proper divisors (73170242).

131312638 is a wasteful number, since it uses less digits than its factorization.

131312638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8051.

The product of its digits is 2592, while the sum is 28.

The square root of 131312638 is about 11459.1726577445. The cubic root of 131312638 is about 508.2790100389.

Adding to 131312638 its reverse (836213131), we get a palindrome (967525769).

The spelling of 131312638 in words is "one hundred thirty-one million, three hundred twelve thousand, six hundred thirty-eight".