131866642 has 8 divisors (see below), whose sum is σ = 200304000. Its totient is φ = 65098644.

The previous prime is 131866627. The next prime is 131866649. The reversal of 131866642 is 246668131.

It is a happy number.

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

It is a super-2 number, since 2×131866642² = 34777622544712328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131866649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 417142 + ... + 417457.

It is an arithmetic number, because the mean of its divisors is an integer number (25038000).

Almost surely, 2^131866642 is an apocalyptic number.

131866642 is a deficient number, since it is larger than the sum of its proper divisors (68437358).

131866642 is an equidigital number, since it uses as much as digits as its factorization.

131866642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834680.

The product of its digits is 41472, while the sum is 37.

The square root of 131866642 is about 11483.3201644820. The cubic root of 131866642 is about 508.9928116703.

The spelling of 131866642 in words is "one hundred thirty-one million, eight hundred sixty-six thousand, six hundred forty-two".