1042721775749 has 2 divisors, whose sum is σ = 1042721775750. Its totient is φ = 1042721775748.

The previous prime is 1042721775709. The next prime is 1042721775791. The reversal of 1042721775749 is 9475771272401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 677893695649 + 364828080100 = 823343^2 + 604010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1042721775749 is a prime.

It is a super-2 number, since 2×1042721775749² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1042721775694 and 1042721775703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1042721775709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521360887874 + 521360887875.

It is an arithmetic number, because the mean of its divisors is an integer number (521360887875).

Almost surely, 2^{1042721775749} is an apocalyptic number.

It is an amenable number.

1042721775749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1042721775749 is an equidigital number, since it uses as much as digits as its factorization.

1042721775749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6914880, while the sum is 56.

The spelling of 1042721775749 in words is "one trillion, forty-two billion, seven hundred twenty-one million, seven hundred seventy-five thousand, seven hundred forty-nine".