1684138525 has 6 divisors (see below), whose sum is σ = 2088331802. Its totient is φ = 1347310800.

The previous prime is 1684138523. The next prime is 1684138537. The reversal of 1684138525 is 5258314861.

It can be written as a sum of positive squares in 3 ways, for example, as 39917124 + 1644221401 = 6318^2 + 40549^2 .

It is not a de Polignac number, because 1684138525 - 2¹ = 1684138523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1684138523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33682746 + ... + 33682795.

Almost surely, 2^1684138525 is an apocalyptic number.

It is an amenable number.

1684138525 is a deficient number, since it is larger than the sum of its proper divisors (404193277).

1684138525 is an equidigital number, since it uses as much as digits as its factorization.

1684138525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67365551 (or 67365546 counting only the distinct ones).

The product of its digits is 230400, while the sum is 43.

The square root of 1684138525 is about 41038.2568465085. The cubic root of 1684138525 is about 1189.7597436486.

The spelling of 1684138525 in words is "one billion, six hundred eighty-four million, one hundred thirty-eight thousand, five hundred twenty-five".