131717820 has 48 divisors (see below), whose sum is σ = 397182240. Its totient is φ = 32422656.

The previous prime is 131717813. The next prime is 131717821. The reversal of 131717820 is 28717131.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131717821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83655 + ... + 85214.

It is an arithmetic number, because the mean of its divisors is an integer number (8274630).

Almost surely, 2^131717820 is an apocalyptic number.

131717820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131717820 is an abundant number, since it is smaller than the sum of its proper divisors (265464420).

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

131717820 is a wasteful number, since it uses less digits than its factorization.

131717820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168894 (or 168892 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 30.

The square root of 131717820 is about 11476.8384148249. The cubic root of 131717820 is about 508.8012599599.

The spelling of 131717820 in words is "one hundred thirty-one million, seven hundred seventeen thousand, eight hundred twenty".