749393681 has 2 divisors, whose sum is σ = 749393682. Its totient is φ = 749393680.

The previous prime is 749393647. The next prime is 749393693. The reversal of 749393681 is 186393947.

749393681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 525143056 + 224250625 = 22916^2 + 14975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-749393681 is a prime.

It is a super-2 number, since 2×749393681² = 1123181778245459522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (749392681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374696840 + 374696841.

It is an arithmetic number, because the mean of its divisors is an integer number (374696841).

Almost surely, 2^749393681 is an apocalyptic number.

It is an amenable number.

749393681 is a deficient number, since it is larger than the sum of its proper divisors (1).

749393681 is an equidigital number, since it uses as much as digits as its factorization.

749393681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 50.

The square root of 749393681 is about 27375.0558172947. The cubic root of 749393681 is about 908.3153960228.

The spelling of 749393681 in words is "seven hundred forty-nine million, three hundred ninety-three thousand, six hundred eighty-one".