691829389 has 4 divisors (see below), whose sum is σ = 693919840. Its totient is φ = 689738940.

The previous prime is 691829357. The next prime is 691829407. The reversal of 691829389 is 983928196.

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 691829389 - 2⁵ = 691829357 is a prime.

It is a super-2 number, since 2×691829389² = 957255806968226642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691829309) 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, 1044729 + ... + 1045390.

It is an arithmetic number, because the mean of its divisors is an integer number (173479960).

Almost surely, 2^691829389 is an apocalyptic number.

It is an amenable number.

691829389 is a deficient number, since it is larger than the sum of its proper divisors (2090451).

691829389 is a wasteful number, since it uses less digits than its factorization.

691829389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090450.

The product of its digits is 1679616, while the sum is 55.

The square root of 691829389 is about 26302.6498474964. The cubic root of 691829389 is about 884.4358450298.

The spelling of 691829389 in words is "six hundred ninety-one million, eight hundred twenty-nine thousand, three hundred eighty-nine".