711840649 has 4 divisors (see below), whose sum is σ = 766597636. Its totient is φ = 657083664.

The previous prime is 711840599. The next prime is 711840667. The reversal of 711840649 is 946048117.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 478209424 + 233631225 = 21868^2 + 15285^2 .

It is a cyclic number.

It is not a de Polignac number, because 711840649 - 2⁹ = 711840137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (711840749) 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, 27378474 + ... + 27378499.

It is an arithmetic number, because the mean of its divisors is an integer number (191649409).

Almost surely, 2^711840649 is an apocalyptic number.

It is an amenable number.

711840649 is a deficient number, since it is larger than the sum of its proper divisors (54756987).

711840649 is a wasteful number, since it uses less digits than its factorization.

711840649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54756986.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 711840649 is about 26680.3419955592. The cubic root of 711840649 is about 892.8823978923.

The spelling of 711840649 in words is "seven hundred eleven million, eight hundred forty thousand, six hundred forty-nine".