693957421 has 2 divisors, whose sum is σ = 693957422. Its totient is φ = 693957420.

The previous prime is 693957419. The next prime is 693957457. The reversal of 693957421 is 124759396.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396567396 + 297390025 = 19914^2 + 17245^2 .

It is a cyclic number.

It is not a de Polignac number, because 693957421 - 2¹ = 693957419 is a prime.

Together with 693957419, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (693957401) 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 as a sum of consecutive naturals, namely, 346978710 + 346978711.

It is an arithmetic number, because the mean of its divisors is an integer number (346978711).

Almost surely, 2^693957421 is an apocalyptic number.

It is an amenable number.

693957421 is a deficient number, since it is larger than the sum of its proper divisors (1).

693957421 is an equidigital number, since it uses as much as digits as its factorization.

693957421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The square root of 693957421 is about 26343.0715938745. The cubic root of 693957421 is about 885.3417433843.

The spelling of 693957421 in words is "six hundred ninety-three million, nine hundred fifty-seven thousand, four hundred twenty-one".