691104609 has 32 divisors (see below), whose sum is σ = 1104216960. Its totient is φ = 424678464.

The previous prime is 691104599. The next prime is 691104647. The reversal of 691104609 is 906401196.

It is not a de Polignac number, because 691104609 - 2⁴ = 691104593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (691104649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 407367 + ... + 409059.

It is an arithmetic number, because the mean of its divisors is an integer number (34506780).

Almost surely, 2^691104609 is an apocalyptic number.

It is an amenable number.

691104609 is a deficient number, since it is larger than the sum of its proper divisors (413112351).

691104609 is a wasteful number, since it uses less digits than its factorization.

691104609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2878 (or 2872 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 691104609 is about 26288.8685378432. The cubic root of 691104609 is about 884.1268837922.

The spelling of 691104609 in words is "six hundred ninety-one million, one hundred four thousand, six hundred nine".