1954867986439 has 2 divisors, whose sum is σ = 1954867986440. Its totient is φ = 1954867986438.

The previous prime is 1954867986413. The next prime is 1954867986481. The reversal of 1954867986439 is 9346897684591.

It is a weak prime.

It is an emirp because it is prime and its reverse (9346897684591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1954867986439 - 2¹⁹ = 1954867462151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1954867086439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977433993219 + 977433993220.

It is an arithmetic number, because the mean of its divisors is an integer number (977433993220).

Almost surely, 2^{1954867986439} is an apocalyptic number.

1954867986439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1954867986439 is an equidigital number, since it uses as much as digits as its factorization.

1954867986439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2821754880, while the sum is 79.

The spelling of 1954867986439 in words is "one trillion, nine hundred fifty-four billion, eight hundred sixty-seven million, nine hundred eighty-six thousand, four hundred thirty-nine".