691055001 has 24 divisors (see below), whose sum is σ = 1228543680. Its totient is φ = 364512096.

The previous prime is 691054979. The next prime is 691055051. The reversal of 691055001 is 100550196.

It is not a de Polignac number, because 691055001 - 2¹¹ = 691052953 is a prime.

It is a super-2 number, since 2×691055001² = 955114028814220002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (691055051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 421071 + ... + 422708.

It is an arithmetic number, because the mean of its divisors is an integer number (51189320).

Almost surely, 2^691055001 is an apocalyptic number.

It is an amenable number.

691055001 is a deficient number, since it is larger than the sum of its proper divisors (537488679).

691055001 is a wasteful number, since it uses less digits than its factorization.

691055001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843805 (or 843802 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 691055001 is about 26287.9250036970. The cubic root of 691055001 is about 884.1057288588.

The spelling of 691055001 in words is "six hundred ninety-one million, fifty-five thousand, one".