1694227921 has 3 divisors (see below), whose sum is σ = 1694269083. Its totient is φ = 1694186760.

The previous prime is 1694227889. The next prime is 1694227949. The reversal of 1694227921 is 1297224961.

The square root of 1694227921 is 41161.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1297224961 = 13171 ⋅98491.

It can be written as a sum of positive squares in only one way, i.e., 1217242321 + 476985600 = 34889^2 + 21840^2 .

It is not a de Polignac number, because 1694227921 - 2⁵ = 1694227889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1694227991) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 20581 + ... + 61741.

It is an arithmetic number, because the mean of its divisors is an integer number (564756361).

Almost surely, 2^1694227921 is an apocalyptic number.

1694227921 is the 41161-st square number.

1694227921 is the 20581-st centered octagonal number.

It is an amenable number.

1694227921 is a deficient number, since it is larger than the sum of its proper divisors (41162).

1694227921 is an frugal number, since it uses more digits than its factorization.

1694227921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82322 (or 41161 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The cubic root of 1694227921 is about 1192.1308996320.

The spelling of 1694227921 in words is "one billion, six hundred ninety-four million, two hundred twenty-seven thousand, nine hundred twenty-one".