131428779 has 8 divisors (see below), whose sum is σ = 178967040. Its totient is φ = 85754856.

The previous prime is 131428771. The next prime is 131428793. The reversal of 131428779 is 977824131.

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

It is not a de Polignac number, because 131428779 - 2³ = 131428771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131428779.

It is not an unprimeable number, because it can be changed into a prime (131428771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465919 + ... + 466200.

It is an arithmetic number, because the mean of its divisors is an integer number (22370880).

Almost surely, 2^131428779 is an apocalyptic number.

131428779 is a deficient number, since it is larger than the sum of its proper divisors (47538261).

131428779 is an equidigital number, since it uses as much as digits as its factorization.

131428779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932169.

The product of its digits is 84672, while the sum is 42.

The square root of 131428779 is about 11464.2391374221. The cubic root of 131428779 is about 508.4288169884.

The spelling of 131428779 in words is "one hundred thirty-one million, four hundred twenty-eight thousand, seven hundred seventy-nine".