131289642 has 48 divisors (see below), whose sum is σ = 313271712. Its totient is φ = 39406560.

The previous prime is 131289611. The next prime is 131289661. The reversal of 131289642 is 246982131.

131289642 is a `hidden beast` number, since 1 + 3 + 1 + 2 + 8 + 9 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 131289597 and 131289606.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18088 + ... + 24284.

It is an arithmetic number, because the mean of its divisors is an integer number (6526494).

Almost surely, 2^131289642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131289642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156635856).

131289642 is an abundant number, since it is smaller than the sum of its proper divisors (181982070).

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

131289642 is a wasteful number, since it uses less digits than its factorization.

131289642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6323 (or 6320 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 131289642 is about 11458.1692254915. The cubic root of 131289642 is about 508.2493376818.

The spelling of 131289642 in words is "one hundred thirty-one million, two hundred eighty-nine thousand, six hundred forty-two".