1749043981 has 2 divisors, whose sum is σ = 1749043982. Its totient is φ = 1749043980.

The previous prime is 1749043949. The next prime is 1749043991. The reversal of 1749043981 is 1893409471.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1685841481 + 63202500 = 41059^2 + 7950^2 .

It is a cyclic number.

It is not a de Polignac number, because 1749043981 - 2⁵ = 1749043949 is a prime.

It is a super-2 number, since 2×1749043981² = 6118309694944656722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1749043921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 874521990 + 874521991.

It is an arithmetic number, because the mean of its divisors is an integer number (874521991).

Almost surely, 2^1749043981 is an apocalyptic number.

It is an amenable number.

1749043981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1749043981 is an equidigital number, since it uses as much as digits as its factorization.

1749043981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 1749043981 is about 41821.5731530989. The cubic root of 1749043981 is about 1204.8516500394.

The spelling of 1749043981 in words is "one billion, seven hundred forty-nine million, forty-three thousand, nine hundred eighty-one".