1689413749 has 2 divisors, whose sum is σ = 1689413750. Its totient is φ = 1689413748.

The previous prime is 1689413741. The next prime is 1689413773. The reversal of 1689413749 is 9473149861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1436031025 + 253382724 = 37895^2 + 15918^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689413749 - 2³ = 1689413741 is a prime.

It is a super-3 number, since 3×1689413749³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1689413696 and 1689413705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1689413741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844706874 + 844706875.

It is an arithmetic number, because the mean of its divisors is an integer number (844706875).

Almost surely, 2^1689413749 is an apocalyptic number.

It is an amenable number.

1689413749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689413749 is an equidigital number, since it uses as much as digits as its factorization.

1689413749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 52.

The square root of 1689413749 is about 41102.4786235575. The cubic root of 1689413749 is about 1191.0006763099. Note that the first 3 decimals are identical.

The spelling of 1689413749 in words is "one billion, six hundred eighty-nine million, four hundred thirteen thousand, seven hundred forty-nine".