690919 has 2 divisors, whose sum is σ = 690920. Its totient is φ = 690918.

The previous prime is 690889. The next prime is 690929. The reversal of 690919 is 919096.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690919 - 2⁵ = 690887 is a prime.

It is a super-2 number, since 2×690919² = 954738129122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345459 + 345460.

It is an arithmetic number, because the mean of its divisors is an integer number (345460).

2⁶⁹⁰⁹¹⁹ is an apocalyptic number.

690919 is a deficient number, since it is larger than the sum of its proper divisors (1).

690919 is an equidigital number, since it uses as much as digits as its factorization.

690919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 690919 is about 831.2153752187. The cubic root of 690919 is about 88.4047727131.

The spelling of 690919 in words is "six hundred ninety thousand, nine hundred nineteen".