1697420321 has 2 divisors, whose sum is σ = 1697420322. Its totient is φ = 1697420320.

The previous prime is 1697420299. The next prime is 1697420341. The reversal of 1697420321 is 1230247961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1314787600 + 382632721 = 36260^2 + 19561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1697420321 is a prime.

It is a super-2 number, since 2×1697420321² = 5762471492287486082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1697420341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 848710160 + 848710161.

It is an arithmetic number, because the mean of its divisors is an integer number (848710161).

Almost surely, 2^1697420321 is an apocalyptic number.

It is an amenable number.

1697420321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1697420321 is an equidigital number, since it uses as much as digits as its factorization.

1697420321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 1697420321 is about 41199.7611764923. The cubic root of 1697420321 is about 1192.8791993470.

The spelling of 1697420321 in words is "one billion, six hundred ninety-seven million, four hundred twenty thousand, three hundred twenty-one".