131451388609 has 4 divisors (see below), whose sum is σ = 131452127316. Its totient is φ = 131450649904.

The previous prime is 131451388559. The next prime is 131451388681. The reversal of 131451388609 is 906883154131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 906883154131 = 191 ⋅4748079341.

It can be written as a sum of positive squares in 2 ways, for example, as 119683478209 + 11767910400 = 345953^2 + 108480^2 .

It is a cyclic number.

It is not a de Polignac number, because 131451388609 - 2¹⁷ = 131451257537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131451388009) 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, 78927 + ... + 518779.

It is an arithmetic number, because the mean of its divisors is an integer number (32863031829).

Almost surely, 2^131451388609 is an apocalyptic number.

It is an amenable number.

131451388609 is a deficient number, since it is larger than the sum of its proper divisors (738707).

131451388609 is an equidigital number, since it uses as much as digits as its factorization.

131451388609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738706.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 131451388609 in words is "one hundred thirty-one billion, four hundred fifty-one million, three hundred eighty-eight thousand, six hundred nine".