690706249 has 4 divisors (see below), whose sum is σ = 692685700. Its totient is φ = 688726800.

The previous prime is 690706223. The next prime is 690706267. The reversal of 690706249 is 942607096.

690706249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 326163600 + 364542649 = 18060^2 + 19093^2 .

It is a cyclic number.

It is not a de Polignac number, because 690706249 - 2⁹ = 690705737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690706279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 989202 + ... + 989899.

It is an arithmetic number, because the mean of its divisors is an integer number (173171425).

Almost surely, 2^690706249 is an apocalyptic number.

It is an amenable number.

690706249 is a deficient number, since it is larger than the sum of its proper divisors (1979451).

690706249 is a wasteful number, since it uses less digits than its factorization.

690706249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979450.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 690706249 is about 26281.2908549028. The cubic root of 690706249 is about 883.9569777831.

The spelling of 690706249 in words is "six hundred ninety million, seven hundred six thousand, two hundred forty-nine".