690997 has 2 divisors, whose sum is σ = 690998. Its totient is φ = 690996.

The previous prime is 690953. The next prime is 691001. The reversal of 690997 is 799096.

690997 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 can be written as a sum of positive squares in only one way, i.e., 367236 + 323761 = 606^2 + 569^2 .

It is a cyclic number.

It is not a de Polignac number, because 690997 - 2⁷ = 690869 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690397) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345498 + 345499.

It is an arithmetic number, because the mean of its divisors is an integer number (345499).

2⁶⁹⁰⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

690997 is a deficient number, since it is larger than the sum of its proper divisors (1).

690997 is an equidigital number, since it uses as much as digits as its factorization.

690997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 690997 is about 831.2622931422. The cubic root of 690997 is about 88.4080993514.

The spelling of 690997 in words is "six hundred ninety thousand, nine hundred ninety-seven".