709494509 has 4 divisors (see below), whose sum is σ = 710940000. Its totient is φ = 708049020.

The previous prime is 709494493. The next prime is 709494571. The reversal of 709494509 is 905494907.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 905494907 = 2591 ⋅349477.

It is a cyclic number.

It is not a de Polignac number, because 709494509 - 2⁴ = 709494493 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (709494589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722009 + ... + 722990.

It is an arithmetic number, because the mean of its divisors is an integer number (177735000).

Almost surely, 2^709494509 is an apocalyptic number.

It is an amenable number.

709494509 is a deficient number, since it is larger than the sum of its proper divisors (1445491).

709494509 is a wasteful number, since it uses less digits than its factorization.

709494509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445490.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 709494509 is about 26636.3381304563. The cubic root of 709494509 is about 891.9003743795.

The spelling of 709494509 in words is "seven hundred nine million, four hundred ninety-four thousand, five hundred nine".