131601678 has 32 divisors (see below), whose sum is σ = 285175296. Its totient is φ = 40246368.

The previous prime is 131601671. The next prime is 131601689. The reversal of 131601678 is 876106131.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131601671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7975 + ... + 18077.

It is an arithmetic number, because the mean of its divisors is an integer number (8911728).

Almost surely, 2^131601678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131601678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142587648).

131601678 is an abundant number, since it is smaller than the sum of its proper divisors (153573618).

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

131601678 is a wasteful number, since it uses less digits than its factorization.

131601678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10288.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 131601678 is about 11471.7774560004. Note that the first 3 decimals coincide. The cubic root of 131601678 is about 508.6516710561.

The spelling of 131601678 in words is "one hundred thirty-one million, six hundred one thousand, six hundred seventy-eight".