131345646 has 16 divisors (see below), whose sum is σ = 262804608. Its totient is φ = 43763000.

The previous prime is 131345639. The next prime is 131345653. The reversal of 131345646 is 646543131.

It is an interprime number because it is at equal distance from previous prime (131345639) and next prime (131345653).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21871 + ... + 27221.

It is an arithmetic number, because the mean of its divisors is an integer number (16425288).

Almost surely, 2^131345646 is an apocalyptic number.

131345646 is an abundant number, since it is smaller than the sum of its proper divisors (131458962).

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

131345646 is a wasteful number, since it uses less digits than its factorization.

131345646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9447.

The product of its digits is 25920, while the sum is 33.

The square root of 131345646 is about 11460.6128108404. The cubic root of 131345646 is about 508.3215950946.

Adding to 131345646 its reverse (646543131), we get a palindrome (777888777).

The spelling of 131345646 in words is "one hundred thirty-one million, three hundred forty-five thousand, six hundred forty-six".