1689969641 has 2 divisors, whose sum is σ = 1689969642. Its totient is φ = 1689969640.

The previous prime is 1689969629. The next prime is 1689969653. The reversal of 1689969641 is 1469699861.

It is a balanced prime because it is at equal distance from previous prime (1689969629) and next prime (1689969653).

It can be written as a sum of positive squares in only one way, i.e., 1531939600 + 158030041 = 39140^2 + 12571^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689969641 - 2²⁶ = 1622860777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1689969661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844984820 + 844984821.

It is an arithmetic number, because the mean of its divisors is an integer number (844984821).

Almost surely, 2^1689969641 is an apocalyptic number.

It is an amenable number.

1689969641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689969641 is an equidigital number, since it uses as much as digits as its factorization.

1689969641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5038848, while the sum is 59.

The square root of 1689969641 is about 41109.2403359634. The cubic root of 1689969641 is about 1191.1312926544.

The spelling of 1689969641 in words is "one billion, six hundred eighty-nine million, nine hundred sixty-nine thousand, six hundred forty-one".