690619859 has 2 divisors, whose sum is σ = 690619860. Its totient is φ = 690619858.

The previous prime is 690619793. The next prime is 690619879. The reversal of 690619859 is 958916096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690619859 - 2²⁰ = 689571283 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 690619859.

It is not a weakly prime, because it can be changed into another prime (690619879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345309929 + 345309930.

It is an arithmetic number, because the mean of its divisors is an integer number (345309930).

Almost surely, 2^690619859 is an apocalyptic number.

690619859 is a deficient number, since it is larger than the sum of its proper divisors (1).

690619859 is an equidigital number, since it uses as much as digits as its factorization.

690619859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The square root of 690619859 is about 26279.6472388805. The cubic root of 690619859 is about 883.9201226427.

The spelling of 690619859 in words is "six hundred ninety million, six hundred nineteen thousand, eight hundred fifty-nine".