749997799981 has 2 divisors, whose sum is σ = 749997799982. Its totient is φ = 749997799980.

The previous prime is 749997799939. The next prime is 749997800003. The reversal of 749997799981 is 189997799947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 431609580900 + 318388219081 = 656970^2 + 564259^2 .

It is an emirp because it is prime and its reverse (189997799947) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 749997799981 - 2³¹ = 747850316333 is a prime.

It is a super-2 number, since 2×749997799981² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 749997799892 and 749997799901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (749997799381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374998899990 + 374998899991.

It is an arithmetic number, because the mean of its divisors is an integer number (374998899991).

Almost surely, 2^749997799981 is an apocalyptic number.

It is an amenable number.

749997799981 is a deficient number, since it is larger than the sum of its proper divisors (1).

749997799981 is an equidigital number, since it uses as much as digits as its factorization.

749997799981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5833096416, while the sum is 88.

The spelling of 749997799981 in words is "seven hundred forty-nine billion, nine hundred ninety-seven million, seven hundred ninety-nine thousand, nine hundred eighty-one".