696551221 has 4 divisors (see below), whose sum is σ = 700087212. Its totient is φ = 693015232.

The previous prime is 696551213. The next prime is 696551237. The reversal of 696551221 is 122155696.

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 450500625 + 246050596 = 21225^2 + 15686^2 .

It is a cyclic number.

It is not a de Polignac number, because 696551221 - 2³ = 696551213 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 (696551201) 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, 1767700 + ... + 1768093.

It is an arithmetic number, because the mean of its divisors is an integer number (175021803).

Almost surely, 2^696551221 is an apocalyptic number.

It is an amenable number.

696551221 is a deficient number, since it is larger than the sum of its proper divisors (3535991).

696551221 is a wasteful number, since it uses less digits than its factorization.

696551221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3535990.

The product of its digits is 32400, while the sum is 37.

The square root of 696551221 is about 26392.2568379440. The cubic root of 696551221 is about 886.4434172488.

It can be divided in two parts, 69655 and 1221, that added together give a triangular number (70876 = T₃₇₆).

The spelling of 696551221 in words is "six hundred ninety-six million, five hundred fifty-one thousand, two hundred twenty-one".