694025221 has 4 divisors (see below), whose sum is σ = 734850252. Its totient is φ = 653200192.

The previous prime is 694025183. The next prime is 694025231. The reversal of 694025221 is 122520496.

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 239909121 + 454116100 = 15489^2 + 21310^2 .

It is a cyclic number.

It is not a de Polignac number, because 694025221 - 2⁷ = 694025093 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (694025231) 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, 20412490 + ... + 20412523.

It is an arithmetic number, because the mean of its divisors is an integer number (183712563).

Almost surely, 2^694025221 is an apocalyptic number.

It is an amenable number.

694025221 is a deficient number, since it is larger than the sum of its proper divisors (40825031).

694025221 is a wasteful number, since it uses less digits than its factorization.

694025221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40825030.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 694025221 is about 26344.3584283239. The cubic root of 694025221 is about 885.3705752279.

The spelling of 694025221 in words is "six hundred ninety-four million, twenty-five thousand, two hundred twenty-one".