131321151720 has 512 divisors, whose sum is σ = 491194368000. Its totient is φ = 30931200000.

The previous prime is 131321151691. The next prime is 131321151809. The reversal of 131321151720 is 27151123131.

131321151720 is a `hidden beast` number, since 1 + 3 + 132 + 11 + 517 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 174861345 + ... + 174862095.

It is an arithmetic number, because the mean of its divisors is an integer number (959364000).

Almost surely, 2^131321151720 is an apocalyptic number.

131321151720 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 131321151720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245597184000).

131321151720 is an abundant number, since it is smaller than the sum of its proper divisors (359873216280).

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

131321151720 is a wasteful number, since it uses less digits than its factorization.

131321151720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182 (or 1172 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

Adding to 131321151720 its reverse (27151123131), we get a palindrome (158472274851).

The spelling of 131321151720 in words is "one hundred thirty-one billion, three hundred twenty-one million, one hundred fifty-one thousand, seven hundred twenty".