1690304513 has 4 divisors (see below), whose sum is σ = 1691096148. Its totient is φ = 1689512880.

The previous prime is 1690304507. The next prime is 1690304521. The reversal of 1690304513 is 3154030961.

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 1073676289 + 616628224 = 32767^2 + 24832^2 .

It is a cyclic number.

It is not a de Polignac number, because 1690304513 - 2¹⁴ = 1690288129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1690304513.

It is not an unprimeable number, because it can be changed into a prime (1690304533) 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, 392606 + ... + 396887.

It is an arithmetic number, because the mean of its divisors is an integer number (422774037).

It is a Proth number, since it is equal to 403 ⋅ 2²² + 1 and 403 < 2²².

Almost surely, 2^1690304513 is an apocalyptic number.

It is an amenable number.

1690304513 is a deficient number, since it is larger than the sum of its proper divisors (791635).

1690304513 is an equidigital number, since it uses as much as digits as its factorization.

1690304513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791634.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 1690304513 is about 41113.3130871254. The cubic root of 1690304513 is about 1191.2099627412.

The spelling of 1690304513 in words is "one billion, six hundred ninety million, three hundred four thousand, five hundred thirteen".