691324453 has 4 divisors (see below), whose sum is σ = 691480588. Its totient is φ = 691168320.

The previous prime is 691324451. The next prime is 691324463. The reversal of 691324453 is 354423196.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 280127169 + 411197284 = 16737^2 + 20278^2 .

It is a cyclic number.

It is not a de Polignac number, because 691324453 - 2¹ = 691324451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691324451) 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, 71226 + ... + 80347.

It is an arithmetic number, because the mean of its divisors is an integer number (172870147).

Almost surely, 2^691324453 is an apocalyptic number.

It is an amenable number.

691324453 is a deficient number, since it is larger than the sum of its proper divisors (156135).

691324453 is a wasteful number, since it uses less digits than its factorization.

691324453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156134.

The product of its digits is 77760, while the sum is 37.

The square root of 691324453 is about 26293.0495188367. The cubic root of 691324453 is about 884.2206223192.

The spelling of 691324453 in words is "six hundred ninety-one million, three hundred twenty-four thousand, four hundred fifty-three".