131311028 has 12 divisors (see below), whose sum is σ = 235399332. Its totient is φ = 64054080.

The previous prime is 131311027. The next prime is 131311031. The reversal of 131311028 is 820113131.

It can be written as a sum of positive squares in 2 ways, for example, as 17205904 + 114105124 = 4148^2 + 10682^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131311027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400175 + ... + 400502.

It is an arithmetic number, because the mean of its divisors is an integer number (19616611).

Almost surely, 2^131311028 is an apocalyptic number.

It is an amenable number.

131311028 is a deficient number, since it is larger than the sum of its proper divisors (104088304).

131311028 is a wasteful number, since it uses less digits than its factorization.

131311028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800722 (or 800720 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 131311028 is about 11459.1024081295. The cubic root of 131311028 is about 508.2769327254.

Adding to 131311028 its reverse (820113131), we get a palindrome (951424159).

The spelling of 131311028 in words is "one hundred thirty-one million, three hundred eleven thousand, twenty-eight".