131569641 has 12 divisors (see below), whose sum is σ = 217194432. Its totient is φ = 75182616.

The previous prime is 131569639. The next prime is 131569643. The reversal of 131569641 is 146965131.

131569641 is a `hidden beast` number, since 1 + 3 + 1 + 5 + 6 + 9 + 641 = 666.

It is an interprime number because it is at equal distance from previous prime (131569639) and next prime (131569643).

It is not a de Polignac number, because 131569641 - 2¹ = 131569639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131569596 and 131569605.

It is not an unprimeable number, because it can be changed into a prime (131569643) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 1044141 + ... + 1044266.

It is an arithmetic number, because the mean of its divisors is an integer number (18099536).

Almost surely, 2^131569641 is an apocalyptic number.

It is an amenable number.

131569641 is a deficient number, since it is larger than the sum of its proper divisors (85624791).

131569641 is a wasteful number, since it uses less digits than its factorization.

131569641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088420 (or 2088417 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 131569641 is about 11470.3810311602. The cubic root of 131569641 is about 508.6103924637.

The spelling of 131569641 in words is "one hundred thirty-one million, five hundred sixty-nine thousand, six hundred forty-one".