691400093 has 8 divisors (see below), whose sum is σ = 710974680. Its totient is φ = 671872320.

The previous prime is 691400077. The next prime is 691400117. The reversal of 691400093 is 390004196.

It can be written as a sum of positive squares in 4 ways, for example, as 366607609 + 324792484 = 19147^2 + 18022^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 691400093 - 2⁴ = 691400077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691400293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19403 + ... + 41943.

It is an arithmetic number, because the mean of its divisors is an integer number (88871835).

Almost surely, 2^691400093 is an apocalyptic number.

It is an amenable number.

691400093 is a deficient number, since it is larger than the sum of its proper divisors (19574587).

691400093 is a wasteful number, since it uses less digits than its factorization.

691400093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23407.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 691400093 is about 26294.4878824441. The cubic root of 691400093 is about 884.2528696036.

The spelling of 691400093 in words is "six hundred ninety-one million, four hundred thousand, ninety-three".