1981754113 has 2 divisors, whose sum is σ = 1981754114. Its totient is φ = 1981754112.

The previous prime is 1981754053. The next prime is 1981754123. The reversal of 1981754113 is 3114571891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1591770609 + 389983504 = 39897^2 + 19748^2 .

It is a cyclic number.

It is not a de Polignac number, because 1981754113 - 2¹³ = 1981745921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1981754123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990877056 + 990877057.

It is an arithmetic number, because the mean of its divisors is an integer number (990877057).

Almost surely, 2^1981754113 is an apocalyptic number.

It is an amenable number.

1981754113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981754113 is an equidigital number, since it uses as much as digits as its factorization.

1981754113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 40.

The square root of 1981754113 is about 44516.8969381290. The cubic root of 1981754113 is about 1256.0779430936.

The spelling of 1981754113 in words is "one billion, nine hundred eighty-one million, seven hundred fifty-four thousand, one hundred thirteen".