690953 has 2 divisors, whose sum is σ = 690954. Its totient is φ = 690952.

The previous prime is 690929. The next prime is 690997. The reversal of 690953 is 359096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 537289 + 153664 = 733^2 + 392^2 .

It is a cyclic number.

It is not a de Polignac number, because 690953 - 2⁶ = 690889 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (690553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345476 + 345477.

It is an arithmetic number, because the mean of its divisors is an integer number (345477).

2⁶⁹⁰⁹⁵³ is an apocalyptic number.

It is an amenable number.

690953 is a deficient number, since it is larger than the sum of its proper divisors (1).

690953 is an equidigital number, since it uses as much as digits as its factorization.

690953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 690953 is about 831.2358269468. The cubic root of 690953 is about 88.4062228170.

The spelling of 690953 in words is "six hundred ninety thousand, nine hundred fifty-three".