1389524561 has 4 divisors (see below), whose sum is σ = 1389639732. Its totient is φ = 1389409392.

The previous prime is 1389524557. The next prime is 1389524581. The reversal of 1389524561 is 1654259831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1654259831 = 7 ⋅236322833.

It can be written as a sum of positive squares in 2 ways, for example, as 1125267025 + 264257536 = 33545^2 + 16256^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389524561 - 2² = 1389524557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389524581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37046 + ... + 64431.

It is an arithmetic number, because the mean of its divisors is an integer number (347409933).

Almost surely, 2^1389524561 is an apocalyptic number.

It is an amenable number.

1389524561 is a deficient number, since it is larger than the sum of its proper divisors (115171).

1389524561 is a wasteful number, since it uses less digits than its factorization.

1389524561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115170.

The product of its digits is 259200, while the sum is 44.

The square root of 1389524561 is about 37276.3270856988. The cubic root of 1389524561 is about 1115.8917734512.

The spelling of 1389524561 in words is "one billion, three hundred eighty-nine million, five hundred twenty-four thousand, five hundred sixty-one".