745419809 has 2 divisors, whose sum is σ = 745419810. Its totient is φ = 745419808.

The previous prime is 745419781. The next prime is 745419821. The reversal of 745419809 is 908914547.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 738317584 + 7102225 = 27172^2 + 2665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-745419809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_38479295 and since 745419809 and 38479295 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (745419839) 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, 372709904 + 372709905.

It is an arithmetic number, because the mean of its divisors is an integer number (372709905).

Almost surely, 2^745419809 is an apocalyptic number.

It is an amenable number.

745419809 is a deficient number, since it is larger than the sum of its proper divisors (1).

745419809 is an equidigital number, since it uses as much as digits as its factorization.

745419809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 745419809 is about 27302.3773506997. The cubic root of 745419809 is about 906.7070165836.

The spelling of 745419809 in words is "seven hundred forty-five million, four hundred nineteen thousand, eight hundred nine".