1689127801 has 9 divisors (see below), whose sum is σ = 1715630799. Its totient is φ = 1663029936.

The previous prime is 1689127793. The next prime is 1689127807. The reversal of 1689127801 is 1087219861.

It is a happy number.

The square root of 1689127801 is 41099.

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

It can be written as a sum of positive squares in only one way, i.e., 958831225 + 730296576 = 30965^2 + 27024^2 .

It is not a de Polignac number, because 1689127801 - 2³ = 1689127793 is a prime.

It is a super-2 number, since 2×1689127801² = 5706305456222191202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1689127807) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2999946 + ... + 3000508.

Almost surely, 2^1689127801 is an apocalyptic number.

1689127801 is the 41099-th square number.

1689127801 is the 20550-th centered octagonal number.

It is an amenable number.

1689127801 is a deficient number, since it is larger than the sum of its proper divisors (26502998).

1689127801 is an frugal number, since it uses more digits than its factorization.

1689127801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 43.

The cubic root of 1689127801 is about 1190.9334767705.

The spelling of 1689127801 in words is "one billion, six hundred eighty-nine million, one hundred twenty-seven thousand, eight hundred one".