691041058889 has 8 divisors (see below), whose sum is σ = 702556584840. Its totient is φ = 679531564800.

The previous prime is 691041058843. The next prime is 691041058927. The reversal of 691041058889 is 988850140196.

It can be written as a sum of positive squares in 4 ways, for example, as 16334884864 + 674706174025 = 127808^2 + 821405^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 691041058889 - 2⁸ = 691041058633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691041055889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1276634 + ... + 1735475.

It is an arithmetic number, because the mean of its divisors is an integer number (87819573105).

Almost surely, 2^691041058889 is an apocalyptic number.

It is an amenable number.

691041058889 is a deficient number, since it is larger than the sum of its proper divisors (11515525951).

691041058889 is a wasteful number, since it uses less digits than its factorization.

691041058889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015931.

The product of its (nonzero) digits is 4976640, while the sum is 59.

The spelling of 691041058889 in words is "six hundred ninety-one billion, forty-one million, fifty-eight thousand, eight hundred eighty-nine".