131723540 has 24 divisors (see below), whose sum is σ = 297898440. Its totient is φ = 48636288.

The previous prime is 131723533. The next prime is 131723549. The reversal of 131723540 is 45327131.

131723540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 18215824 + 113507716 = 4268^2 + 10654^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131723549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253055 + ... + 253574.

It is an arithmetic number, because the mean of its divisors is an integer number (12412435).

Almost surely, 2^131723540 is an apocalyptic number.

131723540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131723540 is an abundant number, since it is smaller than the sum of its proper divisors (166174900).

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

131723540 is a wasteful number, since it uses less digits than its factorization.

131723540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506651 (or 506649 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 131723540 is about 11477.0876096682. The cubic root of 131723540 is about 508.8086249494.

The spelling of 131723540 in words is "one hundred thirty-one million, seven hundred twenty-three thousand, five hundred forty".