131512340 has 72 divisors (see below), whose sum is σ = 298986072. Its totient is φ = 48568320.

The previous prime is 131512331. The next prime is 131512343. The reversal of 131512340 is 43215131.

It can be written as a sum of positive squares in 12 ways, for example, as 24720784 + 106791556 = 4972^2 + 10334^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131512343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 352394 + ... + 352766.

Almost surely, 2^131512340 is an apocalyptic number.

131512340 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 131512340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149493036).

131512340 is an abundant number, since it is smaller than the sum of its proper divisors (167473732).

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

131512340 is a wasteful number, since it uses less digits than its factorization.

131512340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 131512340 is about 11467.8829781263. The cubic root of 131512340 is about 508.5365453467.

Adding to 131512340 its reverse (43215131), we get a palindrome (174727471).

The spelling of 131512340 in words is "one hundred thirty-one million, five hundred twelve thousand, three hundred forty".