1981965467 has 2 divisors, whose sum is σ = 1981965468. Its totient is φ = 1981965466.

The previous prime is 1981965463. The next prime is 1981965481. The reversal of 1981965467 is 7645691891.

It is a weak prime.

It is an emirp because it is prime and its reverse (7645691891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1981965467 - 2² = 1981965463 is a prime.

It is a super-2 number, since 2×1981965467² = 7856374224761056178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1981965463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990982733 + 990982734.

It is an arithmetic number, because the mean of its divisors is an integer number (990982734).

Almost surely, 2^1981965467 is an apocalyptic number.

1981965467 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981965467 is an equidigital number, since it uses as much as digits as its factorization.

1981965467 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 56.

The square root of 1981965467 is about 44519.2707375132. The cubic root of 1981965467 is about 1256.1225950611.

The spelling of 1981965467 in words is "one billion, nine hundred eighty-one million, nine hundred sixty-five thousand, four hundred sixty-seven".