131451765842 has 4 divisors (see below), whose sum is σ = 197177648766. Its totient is φ = 65725882920.

The previous prime is 131451765839. The next prime is 131451765857. The reversal of 131451765842 is 248567154131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 248567154131 = 8231 ⋅30198901.

It can be written as a sum of positive squares in only one way, i.e., 115449768841 + 16001997001 = 339779^2 + 126499^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 32862941459 + ... + 32862941462.

Almost surely, 2^131451765842 is an apocalyptic number.

131451765842 is a deficient number, since it is larger than the sum of its proper divisors (65725882924).

131451765842 is an equidigital number, since it uses as much as digits as its factorization.

131451765842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65725882923.

The product of its digits is 806400, while the sum is 47.

The spelling of 131451765842 in words is "one hundred thirty-one billion, four hundred fifty-one million, seven hundred sixty-five thousand, eight hundred forty-two".