708491561 has 4 divisors (see below), whose sum is σ = 708566400. Its totient is φ = 708416724.

The previous prime is 708491533. The next prime is 708491579. The reversal of 708491561 is 165194807.

708491561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 165194807 = 1433 ⋅115279.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-708491561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (708491501) 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, 20741 + ... + 42978.

It is an arithmetic number, because the mean of its divisors is an integer number (177141600).

Almost surely, 2^708491561 is an apocalyptic number.

It is an amenable number.

708491561 is a deficient number, since it is larger than the sum of its proper divisors (74839).

708491561 is a wasteful number, since it uses less digits than its factorization.

708491561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74838.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 708491561 is about 26617.5047853851. The cubic root of 708491561 is about 891.4799099870.

The spelling of 708491561 in words is "seven hundred eight million, four hundred ninety-one thousand, five hundred sixty-one".