1981954967 has 2 divisors, whose sum is σ = 1981954968. Its totient is φ = 1981954966.

The previous prime is 1981954903. The next prime is 1981955039. The reversal of 1981954967 is 7694591891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1981954967 - 2⁶ = 1981954903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1981954267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990977483 + 990977484.

It is an arithmetic number, because the mean of its divisors is an integer number (990977484).

Almost surely, 2^1981954967 is an apocalyptic number.

1981954967 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981954967 is an equidigital number, since it uses as much as digits as its factorization.

1981954967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 59.

The square root of 1981954967 is about 44519.1528108970. The cubic root of 1981954967 is about 1256.1203768404.

The spelling of 1981954967 in words is "one billion, nine hundred eighty-one million, nine hundred fifty-four thousand, nine hundred sixty-seven".