131721140 has 24 divisors (see below), whose sum is σ = 276848712. Its totient is φ = 52643840.

The previous prime is 131721137. The next prime is 131721197. The reversal of 131721140 is 41127131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 52475536 + 79245604 = 7244^2 + 8902^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32000 + ... + 35880.

It is an arithmetic number, because the mean of its divisors is an integer number (11535363).

Almost surely, 2^131721140 is an apocalyptic number.

131721140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131721140 is an abundant number, since it is smaller than the sum of its proper divisors (145127572).

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

131721140 is a wasteful number, since it uses less digits than its factorization.

131721140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5587 (or 5585 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 131721140 is about 11476.9830530501. The cubic root of 131721140 is about 508.8055347700.

Adding to 131721140 its reverse (41127131), we get a palindrome (172848271).

The spelling of 131721140 in words is "one hundred thirty-one million, seven hundred twenty-one thousand, one hundred forty".