1689969651 has 4 divisors (see below), whose sum is σ = 2253292872. Its totient is φ = 1126646432.

The previous prime is 1689969641. The next prime is 1689969653. The reversal of 1689969651 is 1569699861.

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

It is a cyclic number.

It is not a de Polignac number, because 1689969651 - 2¹⁸ = 1689707507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1689969653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281661606 + ... + 281661611.

It is an arithmetic number, because the mean of its divisors is an integer number (563323218).

Almost surely, 2^1689969651 is an apocalyptic number.

1689969651 is a deficient number, since it is larger than the sum of its proper divisors (563323221).

1689969651 is an equidigital number, since it uses as much as digits as its factorization.

1689969651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563323220.

The product of its digits is 6298560, while the sum is 60.

The square root of 1689969651 is about 41109.2404575906. The cubic root of 1689969651 is about 1191.1312950038.

The spelling of 1689969651 in words is "one billion, six hundred eighty-nine million, nine hundred sixty-nine thousand, six hundred fifty-one".