697924561 has 4 divisors (see below), whose sum is σ = 705766500. Its totient is φ = 690082624.

The previous prime is 697924559. The next prime is 697924571. The reversal of 697924561 is 165429796.

It is a happy number.

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 492174225 + 205750336 = 22185^2 + 14344^2 .

It is a cyclic number.

It is not a de Polignac number, because 697924561 - 2¹ = 697924559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (697924501) 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 3 ways as a sum of consecutive naturals, for example, 3920836 + ... + 3921013.

It is an arithmetic number, because the mean of its divisors is an integer number (176441625).

Almost surely, 2^697924561 is an apocalyptic number.

It is an amenable number.

697924561 is a deficient number, since it is larger than the sum of its proper divisors (7841939).

697924561 is an equidigital number, since it uses as much as digits as its factorization.

697924561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7841938.

The product of its digits is 816480, while the sum is 49.

The square root of 697924561 is about 26418.2618845374. The cubic root of 697924561 is about 887.0256137249.

The spelling of 697924561 in words is "six hundred ninety-seven million, nine hundred twenty-four thousand, five hundred sixty-one".