690231205 has 4 divisors (see below), whose sum is σ = 828277452. Its totient is φ = 552184960.

The previous prime is 690231193. The next prime is 690231211. The reversal of 690231205 is 502132096.

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 110481121 + 579750084 = 10511^2 + 24078^2 .

It is not a de Polignac number, because 690231205 - 2⁷ = 690231077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69023116 + ... + 69023125.

It is an arithmetic number, because the mean of its divisors is an integer number (207069363).

Almost surely, 2^690231205 is an apocalyptic number.

It is an amenable number.

690231205 is a deficient number, since it is larger than the sum of its proper divisors (138046247).

690231205 is a wasteful number, since it uses less digits than its factorization.

690231205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138046246.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 690231205 is about 26272.2516164869. The cubic root of 690231205 is about 883.7542795717.

The spelling of 690231205 in words is "six hundred ninety million, two hundred thirty-one thousand, two hundred five".