709163681 has 4 divisors (see below), whose sum is σ = 710202672. Its totient is φ = 708124692.

The previous prime is 709163677. The next prime is 709163699. The reversal of 709163681 is 186361907.

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: 186361907 = 67 ⋅2781521.

It is a cyclic number.

It is not a de Polignac number, because 709163681 - 2² = 709163677 is a prime.

It is a super-2 number, since 2×709163681² = 1005826252898939522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (709163641) 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, 518471 + ... + 519836.

It is an arithmetic number, because the mean of its divisors is an integer number (177550668).

Almost surely, 2^709163681 is an apocalyptic number.

It is an amenable number.

709163681 is a deficient number, since it is larger than the sum of its proper divisors (1038991).

709163681 is a wasteful number, since it uses less digits than its factorization.

709163681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038990.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 709163681 is about 26630.1273185090. The cubic root of 709163681 is about 891.7617256717.

The spelling of 709163681 in words is "seven hundred nine million, one hundred sixty-three thousand, six hundred eighty-one".