693677891 has 2 divisors, whose sum is σ = 693677892. Its totient is φ = 693677890.

The previous prime is 693677879. The next prime is 693677899. The reversal of 693677891 is 198776396.

693677891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-693677891 is a prime.

It is not a weakly prime, because it can be changed into another prime (693677899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346838945 + 346838946.

It is an arithmetic number, because the mean of its divisors is an integer number (346838946).

Almost surely, 2^693677891 is an apocalyptic number.

693677891 is a deficient number, since it is larger than the sum of its proper divisors (1).

693677891 is an equidigital number, since it uses as much as digits as its factorization.

693677891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 56.

The square root of 693677891 is about 26337.7654898816. The cubic root of 693677891 is about 885.2228538549. Note that the first 3 decimals are identical.

The spelling of 693677891 in words is "six hundred ninety-three million, six hundred seventy-seven thousand, eight hundred ninety-one".