691340233 has 4 divisors (see below), whose sum is σ = 721398528. Its totient is φ = 661281940.

The previous prime is 691340231. The next prime is 691340257. The reversal of 691340233 is 332043196.

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 691340233 - 2¹ = 691340231 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691340195 and 691340204.

It is not an unprimeable number, because it can be changed into a prime (691340231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15029113 + ... + 15029158.

It is an arithmetic number, because the mean of its divisors is an integer number (180349632).

Almost surely, 2^691340233 is an apocalyptic number.

It is an amenable number.

691340233 is a deficient number, since it is larger than the sum of its proper divisors (30058295).

691340233 is a wasteful number, since it uses less digits than its factorization.

691340233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30058294.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 691340233 is about 26293.3495964284. The cubic root of 691340233 is about 884.2273499347.

The spelling of 691340233 in words is "six hundred ninety-one million, three hundred forty thousand, two hundred thirty-three".