749039257 has 2 divisors, whose sum is σ = 749039258. Its totient is φ = 749039256.

The previous prime is 749039243. The next prime is 749039281. The reversal of 749039257 is 752930947.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 536200336 + 212838921 = 23156^2 + 14589^2 .

It is an emirp because it is prime and its reverse (752930947) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-749039257 is a prime.

It is a super-2 number, since 2×749039257² = 1122119617054224098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (749039287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374519628 + 374519629.

It is an arithmetic number, because the mean of its divisors is an integer number (374519629).

Almost surely, 2^749039257 is an apocalyptic number.

It is an amenable number.

749039257 is a deficient number, since it is larger than the sum of its proper divisors (1).

749039257 is an equidigital number, since it uses as much as digits as its factorization.

749039257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 46.

The square root of 749039257 is about 27368.5815671912. The cubic root of 749039257 is about 908.1721782237.

The spelling of 749039257 in words is "seven hundred forty-nine million, thirty-nine thousand, two hundred fifty-seven".