318741556121 has 4 divisors (see below), whose sum is σ = 332599884672. Its totient is φ = 304883227572.

The previous prime is 318741556103. The next prime is 318741556123. The reversal of 318741556121 is 121655147813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 318741556121 - 2³⁰ = 317667814297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318741556123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6929164241 + ... + 6929164286.

It is an arithmetic number, because the mean of its divisors is an integer number (83149971168).

Almost surely, 2^318741556121 is an apocalyptic number.

It is an amenable number.

318741556121 is a deficient number, since it is larger than the sum of its proper divisors (13858328551).

318741556121 is a wasteful number, since it uses less digits than its factorization.

318741556121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13858328550.

The product of its digits is 201600, while the sum is 44.

The spelling of 318741556121 in words is "three hundred eighteen billion, seven hundred forty-one million, five hundred fifty-six thousand, one hundred twenty-one".