131998447 has 4 divisors (see below), whose sum is σ = 150855376. Its totient is φ = 113141520.

The previous prime is 131998441. The next prime is 131998487. The reversal of 131998447 is 744899131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131998447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131998397 and 131998406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131998441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9428454 + ... + 9428467.

It is an arithmetic number, because the mean of its divisors is an integer number (37713844).

Almost surely, 2^131998447 is an apocalyptic number.

131998447 is a deficient number, since it is larger than the sum of its proper divisors (18856929).

131998447 is an equidigital number, since it uses as much as digits as its factorization.

131998447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18856928.

The product of its digits is 217728, while the sum is 46.

The square root of 131998447 is about 11489.0577072273. The cubic root of 131998447 is about 509.1623401596.

The spelling of 131998447 in words is "one hundred thirty-one million, nine hundred ninety-eight thousand, four hundred forty-seven".