749179309 has 2 divisors, whose sum is σ = 749179310. Its totient is φ = 749179308.

The previous prime is 749179297. The next prime is 749179337. The reversal of 749179309 is 903971947.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642470409 + 106708900 = 25347^2 + 10330^2 .

It is an emirp because it is prime and its reverse (903971947) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 749179309 - 2⁷ = 749179181 is a prime.

It is a super-2 number, since 2×749179309² = 1122539274067434962, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (749179339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374589654 + 374589655.

It is an arithmetic number, because the mean of its divisors is an integer number (374589655).

Almost surely, 2^749179309 is an apocalyptic number.

It is an amenable number.

749179309 is a deficient number, since it is larger than the sum of its proper divisors (1).

749179309 is an equidigital number, since it uses as much as digits as its factorization.

749179309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 428652, while the sum is 49.

The square root of 749179309 is about 27371.1400749037. The cubic root of 749179309 is about 908.2287766829.

The spelling of 749179309 in words is "seven hundred forty-nine million, one hundred seventy-nine thousand, three hundred nine".