745839649 has 2 divisors, whose sum is σ = 745839650. Its totient is φ = 745839648.

The previous prime is 745839643. The next prime is 745839671. The reversal of 745839649 is 946938547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 585640000 + 160199649 = 24200^2 + 12657^2 .

It is an emirp because it is prime and its reverse (946938547) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 745839649 - 2¹⁷ = 745708577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 745839649.

It is not a weakly prime, because it can be changed into another prime (745839643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372919824 + 372919825.

It is an arithmetic number, because the mean of its divisors is an integer number (372919825).

Almost surely, 2^745839649 is an apocalyptic number.

It is an amenable number.

745839649 is a deficient number, since it is larger than the sum of its proper divisors (1).

745839649 is an equidigital number, since it uses as much as digits as its factorization.

745839649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 55.

The square root of 745839649 is about 27310.0649761219. The cubic root of 745839649 is about 906.8772116976.

The spelling of 745839649 in words is "seven hundred forty-five million, eight hundred thirty-nine thousand, six hundred forty-nine".