131217240 has 192 divisors, whose sum is σ = 494887680. Its totient is φ = 27244800.

The previous prime is 131217227. The next prime is 131217253. The reversal of 131217240 is 42712131.

It is an interprime number because it is at equal distance from previous prime (131217227) and next prime (131217253).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 100995 + ... + 102285.

It is an arithmetic number, because the mean of its divisors is an integer number (2577540).

Almost surely, 2^131217240 is an apocalyptic number.

131217240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131217240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247443840).

131217240 is an abundant number, since it is smaller than the sum of its proper divisors (363670440).

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

131217240 is a wasteful number, since it uses less digits than its factorization.

131217240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334 (or 1319 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 131217240 is about 11455.0093845444. The cubic root of 131217240 is about 508.1558928006.

Adding to 131217240 its reverse (42712131), we get a palindrome (173929371).

The spelling of 131217240 in words is "one hundred thirty-one million, two hundred seventeen thousand, two hundred forty".