131026321 has 8 divisors (see below), whose sum is σ = 135919080. Its totient is φ = 126158592.

The previous prime is 131026309. The next prime is 131026333. The reversal of 131026321 is 123620131.

It is an interprime number because it is at equal distance from previous prime (131026309) and next prime (131026333).

It can be written as a sum of positive squares in 4 ways, for example, as 13542400 + 117483921 = 3680^2 + 10839^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131026321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131026351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4761 + ... + 16873.

It is an arithmetic number, because the mean of its divisors is an integer number (16989885).

Almost surely, 2^131026321 is an apocalyptic number.

It is an amenable number.

131026321 is a deficient number, since it is larger than the sum of its proper divisors (4892759).

131026321 is a wasteful number, since it uses less digits than its factorization.

131026321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12515.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 131026321 is about 11446.6729227317. The cubic root of 131026321 is about 507.9093202580.

Adding to 131026321 its reverse (123620131), we get a palindrome (254646452).

The spelling of 131026321 in words is "one hundred thirty-one million, twenty-six thousand, three hundred twenty-one".