2978418218231 has 2 divisors, whose sum is σ = 2978418218232. Its totient is φ = 2978418218230.

The previous prime is 2978418218221. The next prime is 2978418218257. The reversal of 2978418218231 is 1328128148792.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2978418218231 is a prime.

It is a super-2 number, since 2×2978418218231² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2978418218201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1489209109115 + 1489209109116.

It is an arithmetic number, because the mean of its divisors is an integer number (1489209109116).

Almost surely, 2^{2978418218231} is an apocalyptic number.

2978418218231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2978418218231 is an equidigital number, since it uses as much as digits as its factorization.

2978418218231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3096576, while the sum is 56.

The spelling of 2978418218231 in words is "two trillion, nine hundred seventy-eight billion, four hundred eighteen million, two hundred eighteen thousand, two hundred thirty-one".