131969789 has 6 divisors (see below), whose sum is σ = 153515934. Its totient is φ = 113116920.

The previous prime is 131969777. The next prime is 131969809. The reversal of 131969789 is 987969131.

It can be written as a sum of positive squares in only one way, i.e., 120012025 + 11957764 = 10955^2 + 3458^2 .

It is not a de Polignac number, because 131969789 - 2⁸ = 131969533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 131969789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131969389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1346582 + ... + 1346679.

It is an arithmetic number, because the mean of its divisors is an integer number (25585989).

Almost surely, 2^131969789 is an apocalyptic number.

It is an amenable number.

131969789 is a deficient number, since it is larger than the sum of its proper divisors (21546145).

131969789 is an equidigital number, since it uses as much as digits as its factorization.

131969789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2693275 (or 2693268 counting only the distinct ones).

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

The square root of 131969789 is about 11487.8104528235. The cubic root of 131969789 is about 509.1254896491.

The spelling of 131969789 in words is "one hundred thirty-one million, nine hundred sixty-nine thousand, seven hundred eighty-nine".