131904591218 has 4 divisors (see below), whose sum is σ = 197856886830. Its totient is φ = 65952295608.

The previous prime is 131904591211. The next prime is 131904591227. The reversal of 131904591218 is 812195409131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 127529694769 + 4374896449 = 357113^2 + 66143^2 .

It is not an unprimeable number, because it can be changed into a prime (131904591211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32976147803 + ... + 32976147806.

Almost surely, 2^131904591218 is an apocalyptic number.

131904591218 is a deficient number, since it is larger than the sum of its proper divisors (65952295612).

131904591218 is an equidigital number, since it uses as much as digits as its factorization.

131904591218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65952295611.

The product of its (nonzero) digits is 77760, while the sum is 44.

The spelling of 131904591218 in words is "one hundred thirty-one billion, nine hundred four million, five hundred ninety-one thousand, two hundred eighteen".