1689802553 has 2 divisors, whose sum is σ = 1689802554. Its totient is φ = 1689802552.

The previous prime is 1689802507. The next prime is 1689802579. The reversal of 1689802553 is 3552089861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1480479529 + 209323024 = 38477^2 + 14468^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689802553 - 2¹² = 1689798457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1689802498 and 1689802507.

It is not a weakly prime, because it can be changed into another prime (1689802253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844901276 + 844901277.

It is an arithmetic number, because the mean of its divisors is an integer number (844901277).

Almost surely, 2^1689802553 is an apocalyptic number.

It is an amenable number.

1689802553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689802553 is an equidigital number, since it uses as much as digits as its factorization.

1689802553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 47.

The square root of 1689802553 is about 41107.2080418994. The cubic root of 1689802553 is about 1191.0920354788.

The spelling of 1689802553 in words is "one billion, six hundred eighty-nine million, eight hundred two thousand, five hundred fifty-three".