709531409 has 2 divisors, whose sum is σ = 709531410. Its totient is φ = 709531408.

The previous prime is 709531399. The next prime is 709531453. The reversal of 709531409 is 904135907.

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., 549761809 + 159769600 = 23447^2 + 12640^2 .

It is an emirp because it is prime and its reverse (904135907) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 709531409 - 2¹⁶ = 709465873 is a prime.

It is not a weakly prime, because it can be changed into another prime (709531909) 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, 354765704 + 354765705.

It is an arithmetic number, because the mean of its divisors is an integer number (354765705).

Almost surely, 2^709531409 is an apocalyptic number.

It is an amenable number.

709531409 is a deficient number, since it is larger than the sum of its proper divisors (1).

709531409 is an equidigital number, since it uses as much as digits as its factorization.

709531409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 709531409 is about 26637.0307842297. The cubic root of 709531409 is about 891.9158363518.

The spelling of 709531409 in words is "seven hundred nine million, five hundred thirty-one thousand, four hundred nine".