131661542 has 4 divisors (see below), whose sum is σ = 197492316. Its totient is φ = 65830770.

The previous prime is 131661529. The next prime is 131661553. The reversal of 131661542 is 245166131.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32915384 + ... + 32915387.

It is an arithmetic number, because the mean of its divisors is an integer number (49373079).

Almost surely, 2^131661542 is an apocalyptic number.

131661542 is a deficient number, since it is larger than the sum of its proper divisors (65830774).

131661542 is an equidigital number, since it uses as much as digits as its factorization.

131661542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65830773.

The product of its digits is 4320, while the sum is 29.

The square root of 131661542 is about 11474.3863452474. The cubic root of 131661542 is about 508.7287858472.

The spelling of 131661542 in words is "one hundred thirty-one million, six hundred sixty-one thousand, five hundred forty-two".