131213502 has 48 divisors (see below), whose sum is σ = 325877760. Its totient is φ = 37377936.

The previous prime is 131213477. The next prime is 131213561. The reversal of 131213502 is 205312131.

131213502 is a `hidden beast` number, since 1 + 312 + 1 + 350 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46899 + ... + 49617.

It is an arithmetic number, because the mean of its divisors is an integer number (6789120).

Almost surely, 2^131213502 is an apocalyptic number.

131213502 is an abundant number, since it is smaller than the sum of its proper divisors (194664258).

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

131213502 is a wasteful number, since it uses less digits than its factorization.

131213502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3117 (or 3114 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 131213502 is about 11454.8462233240. The cubic root of 131213502 is about 508.1510674571.

Adding to 131213502 its reverse (205312131), we get a palindrome (336525633).

The spelling of 131213502 in words is "one hundred thirty-one million, two hundred thirteen thousand, five hundred two".