131028857 has 2 divisors, whose sum is σ = 131028858. Its totient is φ = 131028856.

The previous prime is 131028853. The next prime is 131028889. The reversal of 131028857 is 758820131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122124601 + 8904256 = 11051^2 + 2984^2 .

It is a cyclic number.

It is not a de Polignac number, because 131028857 - 2² = 131028853 is a prime.

It is a super-3 number, since 3×131028857³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131028851) 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 as a sum of consecutive naturals, namely, 65514428 + 65514429.

It is an arithmetic number, because the mean of its divisors is an integer number (65514429).

Almost surely, 2^131028857 is an apocalyptic number.

It is an amenable number.

131028857 is a deficient number, since it is larger than the sum of its proper divisors (1).

131028857 is an equidigital number, since it uses as much as digits as its factorization.

131028857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 131028857 is about 11446.7836967421. The cubic root of 131028857 is about 507.9125970798.

Adding to 131028857 its reverse (758820131), we get a palindrome (889848988).

The spelling of 131028857 in words is "one hundred thirty-one million, twenty-eight thousand, eight hundred fifty-seven".