1918518631231 has 2 divisors, whose sum is σ = 1918518631232. Its totient is φ = 1918518631230.

The previous prime is 1918518631217. The next prime is 1918518631247. The reversal of 1918518631231 is 1321368158191.

It is a weak prime.

It is an emirp because it is prime and its reverse (1321368158191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1918518631231 - 2¹³ = 1918518623039 is a prime.

It is a super-2 number, since 2×1918518631231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918518631291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959259315615 + 959259315616.

It is an arithmetic number, because the mean of its divisors is an integer number (959259315616).

Almost surely, 2^{1918518631231} is an apocalyptic number.

1918518631231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918518631231 is an equidigital number, since it uses as much as digits as its factorization.

1918518631231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 49.

The spelling of 1918518631231 in words is "one trillion, nine hundred eighteen billion, five hundred eighteen million, six hundred thirty-one thousand, two hundred thirty-one".