690614777 has 2 divisors, whose sum is σ = 690614778. Its totient is φ = 690614776.

The previous prime is 690614773. The next prime is 690614779. The reversal of 690614777 is 777416096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 481407481 + 209207296 = 21941^2 + 14464^2 .

It is a cyclic number.

It is not a de Polignac number, because 690614777 - 2² = 690614773 is a prime.

Together with 690614779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (690614773) 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, 345307388 + 345307389.

It is an arithmetic number, because the mean of its divisors is an integer number (345307389).

Almost surely, 2^690614777 is an apocalyptic number.

It is an amenable number.

690614777 is a deficient number, since it is larger than the sum of its proper divisors (1).

690614777 is an equidigital number, since it uses as much as digits as its factorization.

690614777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 690614777 is about 26279.5505479070. The cubic root of 690614777 is about 883.9179544972.

The spelling of 690614777 in words is "six hundred ninety million, six hundred fourteen thousand, seven hundred seventy-seven".