699955891 has 2 divisors, whose sum is σ = 699955892. Its totient is φ = 699955890.

The previous prime is 699955859. The next prime is 699955937. The reversal of 699955891 is 198559996.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 699955891 - 2⁵ = 699955859 is a prime.

It is not a weakly prime, because it can be changed into another prime (699955811) 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, 349977945 + 349977946.

It is an arithmetic number, because the mean of its divisors is an integer number (349977946).

Almost surely, 2^699955891 is an apocalyptic number.

699955891 is a deficient number, since it is larger than the sum of its proper divisors (1).

699955891 is an equidigital number, since it uses as much as digits as its factorization.

699955891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7873200, while the sum is 61.

The square root of 699955891 is about 26456.6795157669. The cubic root of 699955891 is about 887.8853515615.

The spelling of 699955891 in words is "six hundred ninety-nine million, nine hundred fifty-five thousand, eight hundred ninety-one".