131989769 has 8 divisors (see below), whose sum is σ = 134670600. Its totient is φ = 129316096.

The previous prime is 131989727. The next prime is 131989777. The reversal of 131989769 is 967989131.

It can be written as a sum of positive squares in 4 ways, for example, as 96432400 + 35557369 = 9820^2 + 5963^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 131989769 - 2¹² = 131985673 is a prime.

It is a super-2 number, since 2×131989769² = 34842598241346722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131989769.

It is not an unprimeable number, because it can be changed into a prime (131982769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50507 + ... + 53055.

It is an arithmetic number, because the mean of its divisors is an integer number (16833825).

Almost surely, 2^131989769 is an apocalyptic number.

It is an amenable number.

131989769 is a deficient number, since it is larger than the sum of its proper divisors (2680831).

131989769 is an equidigital number, since it uses as much as digits as its factorization.

131989769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3579.

The product of its digits is 734832, while the sum is 53.

The square root of 131989769 is about 11488.6800373237. The cubic root of 131989769 is about 509.1511819283.

The spelling of 131989769 in words is "one hundred thirty-one million, nine hundred eighty-nine thousand, seven hundred sixty-nine".