691695393 has 4 divisors (see below), whose sum is σ = 922260528. Its totient is φ = 461130260.

The previous prime is 691695373. The next prime is 691695449. The reversal of 691695393 is 393596196.

691695393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 691695393 - 2⁹ = 691694881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (691695313) 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, 115282563 + ... + 115282568.

It is an arithmetic number, because the mean of its divisors is an integer number (230565132).

Almost surely, 2^691695393 is an apocalyptic number.

It is an amenable number.

691695393 is a deficient number, since it is larger than the sum of its proper divisors (230565135).

691695393 is a wasteful number, since it uses less digits than its factorization.

691695393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230565134.

The product of its digits is 1180980, while the sum is 51.

The square root of 691695393 is about 26300.1025283173. The cubic root of 691695393 is about 884.3787411063.

The spelling of 691695393 in words is "six hundred ninety-one million, six hundred ninety-five thousand, three hundred ninety-three".