218001522315431 has 4 divisors (see below), whose sum is σ = 218215459041000. Its totient is φ = 217787585589864.

The previous prime is 218001522315397. The next prime is 218001522315443. The reversal of 218001522315431 is 134513225100812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218001522315431 is a prime.

It is a super-2 number, since 2×218001522315431² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218001522315491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106968361256 + ... + 106968363293.

It is an arithmetic number, because the mean of its divisors is an integer number (54553864760250).

Almost surely, 2^{218001522315431} is an apocalyptic number.

218001522315431 is a deficient number, since it is larger than the sum of its proper divisors (213936725569).

218001522315431 is a wasteful number, since it uses less digits than its factorization.

218001522315431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213936725568.

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 218001522315431 in words is "two hundred eighteen trillion, one billion, five hundred twenty-two million, three hundred fifteen thousand, four hundred thirty-one".