691260001 has 4 divisors (see below), whose sum is σ = 731922372. Its totient is φ = 650597632.

The previous prime is 691259999. The next prime is 691260007. The reversal of 691260001 is 100062196.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 504227025 + 187032976 = 22455^2 + 13676^2 .

It is a cyclic number.

It is not a de Polignac number, because 691260001 - 2¹ = 691259999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691260007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20331160 + ... + 20331193.

It is an arithmetic number, because the mean of its divisors is an integer number (182980593).

Almost surely, 2^691260001 is an apocalyptic number.

It is an amenable number.

691260001 is a deficient number, since it is larger than the sum of its proper divisors (40662371).

691260001 is a wasteful number, since it uses less digits than its factorization.

691260001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40662370.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 691260001 is about 26291.8238431646. The cubic root of 691260001 is about 884.1931429119.

The spelling of 691260001 in words is "six hundred ninety-one million, two hundred sixty thousand, one".