131218105502 has 16 divisors (see below), whose sum is σ = 215556034032. Its totient is φ = 59412510720.

The previous prime is 131218105457. The next prime is 131218105517. The reversal of 131218105502 is 205501812131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11598353 + ... + 11609660.

It is an arithmetic number, because the mean of its divisors is an integer number (13472252127).

Almost surely, 2^131218105502 is an apocalyptic number.

131218105502 is a deficient number, since it is larger than the sum of its proper divisors (84337928530).

131218105502 is a wasteful number, since it uses less digits than its factorization.

131218105502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23208283.

The product of its (nonzero) digits is 2400, while the sum is 29.

Adding to 131218105502 its reverse (205501812131), we get a palindrome (336719917633).

The spelling of 131218105502 in words is "one hundred thirty-one billion, two hundred eighteen million, one hundred five thousand, five hundred two".