1690936641 has 21 divisors (see below), whose sum is σ = 2536910929. Its totient is φ = 1126550916.

The previous prime is 1690936613. The next prime is 1690936651. The reversal of 1690936641 is 1466390961.

The square root of 1690936641 is 41121.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1690936641 - 2⁹ = 1690936129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1690936651) by changing a digit.

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 20 ways as a sum of consecutive naturals, for example, 1109506 + ... + 1111028.

Almost surely, 2^1690936641 is an apocalyptic number.

1690936641 is the 41121-st square number.

1690936641 is the 20561-st centered octagonal number.

It is an amenable number.

1690936641 is a deficient number, since it is larger than the sum of its proper divisors (845974288).

1690936641 is an frugal number, since it uses more digits than its factorization.

1690936641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3064 (or 1526 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The cubic root of 1690936641 is about 1191.3584376300.

The spelling of 1690936641 in words is "one billion, six hundred ninety million, nine hundred thirty-six thousand, six hundred forty-one".