691099313 has 4 divisors (see below), whose sum is σ = 691279140. Its totient is φ = 690919488.

The previous prime is 691099307. The next prime is 691099333. The reversal of 691099313 is 313990196.

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 75463969 + 615635344 = 8687^2 + 24812^2 .

It is a cyclic number.

It is not a de Polignac number, because 691099313 - 2¹² = 691095217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (691099333) 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, 84020 + ... + 91877.

It is an arithmetic number, because the mean of its divisors is an integer number (172819785).

Almost surely, 2^691099313 is an apocalyptic number.

It is an amenable number.

691099313 is a deficient number, since it is larger than the sum of its proper divisors (179827).

691099313 is a wasteful number, since it uses less digits than its factorization.

691099313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179826.

The product of its (nonzero) digits is 39366, while the sum is 41.

The square root of 691099313 is about 26288.7678106069. The cubic root of 691099313 is about 884.1246254038.

The spelling of 691099313 in words is "six hundred ninety-one million, ninety-nine thousand, three hundred thirteen".