131388442 has 8 divisors (see below), whose sum is σ = 197133300. Its totient is φ = 65677344.

The previous prime is 131388421. The next prime is 131388451. The reversal of 131388442 is 244883131.

It can be written as a sum of positive squares in 2 ways, for example, as 127667401 + 3721041 = 11299^2 + 1929^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 131388398 and 131388407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6784 + ... + 17572.

Almost surely, 2^131388442 is an apocalyptic number.

131388442 is a deficient number, since it is larger than the sum of its proper divisors (65744858).

131388442 is a wasteful number, since it uses less digits than its factorization.

131388442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16880.

The product of its digits is 18432, while the sum is 34.

The square root of 131388442 is about 11462.4797491642. The cubic root of 131388442 is about 508.3767974541.

The spelling of 131388442 in words is "one hundred thirty-one million, three hundred eighty-eight thousand, four hundred forty-two".