131026388 has 12 divisors (see below), whose sum is σ = 233622900. Its totient is φ = 64276992.

The previous prime is 131026381. The next prime is 131026417. The reversal of 131026388 is 883620131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 106543684 + 24482704 = 10322^2 + 4948^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131026381) 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 3 ways as a sum of consecutive naturals, for example, 308813 + ... + 309236.

It is an arithmetic number, because the mean of its divisors is an integer number (19468575).

Almost surely, 2^131026388 is an apocalyptic number.

It is an amenable number.

131026388 is a deficient number, since it is larger than the sum of its proper divisors (102596512).

131026388 is a wasteful number, since it uses less digits than its factorization.

131026388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618106 (or 618104 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 131026388 is about 11446.6758493460. The cubic root of 131026388 is about 507.9094068307.

The spelling of 131026388 in words is "one hundred thirty-one million, twenty-six thousand, three hundred eighty-eight".