691984601 has 24 divisors (see below), whose sum is σ = 907089792. Its totient is φ = 515750400.

The previous prime is 691984597. The next prime is 691984607. The reversal of 691984601 is 106489196.

It is not a de Polignac number, because 691984601 - 2² = 691984597 is a prime.

It is a super-2 number, since 2×691984601² = 957685376042258402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (691984607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1721 + ... + 37241.

It is an arithmetic number, because the mean of its divisors is an integer number (37795408).

Almost surely, 2^691984601 is an apocalyptic number.

It is an amenable number.

691984601 is a deficient number, since it is larger than the sum of its proper divisors (215105191).

691984601 is a wasteful number, since it uses less digits than its factorization.

691984601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35573 (or 35562 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 691984601 is about 26305.6001832309. The cubic root of 691984601 is about 884.5019811775.

The spelling of 691984601 in words is "six hundred ninety-one million, nine hundred eighty-four thousand, six hundred one".