691054572097 has 16 divisors (see below), whose sum is σ = 703830870592. Its totient is φ = 678326425920.

The previous prime is 691054572059. The next prime is 691054572137. The reversal of 691054572097 is 790275450196.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691054572097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691054572697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69749218 + ... + 69759124.

It is an arithmetic number, because the mean of its divisors is an integer number (43989429412).

Almost surely, 2^691054572097 is an apocalyptic number.

It is an amenable number.

691054572097 is a deficient number, since it is larger than the sum of its proper divisors (12776298495).

691054572097 is a wasteful number, since it uses less digits than its factorization.

691054572097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12208.

The product of its (nonzero) digits is 4762800, while the sum is 55.

The spelling of 691054572097 in words is "six hundred ninety-one billion, fifty-four million, five hundred seventy-two thousand, ninety-seven".