691698393 has 16 divisors (see below), whose sum is σ = 1029222400. Its totient is φ = 459114480.

The previous prime is 691698391. The next prime is 691698407. The reversal of 691698393 is 393896196.

It is not a de Polignac number, because 691698393 - 2¹ = 691698391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691698391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49753 + ... + 62118.

It is an arithmetic number, because the mean of its divisors is an integer number (64326400).

Almost surely, 2^691698393 is an apocalyptic number.

It is an amenable number.

691698393 is a deficient number, since it is larger than the sum of its proper divisors (337524007).

691698393 is a wasteful number, since it uses less digits than its factorization.

691698393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112109 (or 112103 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 54.

The square root of 691698393 is about 26300.1595622536. The cubic root of 691698393 is about 884.3800196713.

The spelling of 691698393 in words is "six hundred ninety-one million, six hundred ninety-eight thousand, three hundred ninety-three".