131616643 has 4 divisors (see below), whose sum is σ = 132196680. Its totient is φ = 131036608.

The previous prime is 131616623. The next prime is 131616647. The reversal of 131616643 is 346616131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346616131 = 53 ⋅6539927.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131616643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131616647) 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, 289678 + ... + 290131.

It is an arithmetic number, because the mean of its divisors is an integer number (33049170).

Almost surely, 2^131616643 is an apocalyptic number.

131616643 is a deficient number, since it is larger than the sum of its proper divisors (580037).

131616643 is an equidigital number, since it uses as much as digits as its factorization.

131616643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580036.

The product of its digits is 7776, while the sum is 31.

The square root of 131616643 is about 11472.4296903489. The cubic root of 131616643 is about 508.6709506577.

The spelling of 131616643 in words is "one hundred thirty-one million, six hundred sixteen thousand, six hundred forty-three".