690564817 has 2 divisors, whose sum is σ = 690564818. Its totient is φ = 690564816.

The previous prime is 690564793. The next prime is 690564841. The reversal of 690564817 is 718465096.

It is a balanced prime because it is at equal distance from previous prime (690564793) and next prime (690564841).

It can be written as a sum of positive squares in only one way, i.e., 584865856 + 105698961 = 24184^2 + 10281^2 .

It is a cyclic number.

It is not a de Polignac number, because 690564817 - 2⁷ = 690564689 is a prime.

It is not a weakly prime, because it can be changed into another prime (690564887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345282408 + 345282409.

It is an arithmetic number, because the mean of its divisors is an integer number (345282409).

Almost surely, 2^690564817 is an apocalyptic number.

It is an amenable number.

690564817 is a deficient number, since it is larger than the sum of its proper divisors (1).

690564817 is an equidigital number, since it uses as much as digits as its factorization.

690564817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 690564817 is about 26278.5999817342. The cubic root of 690564817 is about 883.8966393794.

The spelling of 690564817 in words is "six hundred ninety million, five hundred sixty-four thousand, eight hundred seventeen".