15409001689 has 3 divisors (see below), whose sum is σ = 15409125823. Its totient is φ = 15408877556.

The previous prime is 15409001687. The next prime is 15409001753. The reversal of 15409001689 is 98610090451.

The square root of 15409001689 is 124133.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98610090451 = 23 ⋅4287395237.

It can be written as a sum of positive squares in only one way, i.e., 6928065225 + 8480936464 = 83235^2 + 92092^2 .

It is not a de Polignac number, because 15409001689 - 2¹ = 15409001687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15409001681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 62067 + ... + 186199.

Almost surely, 2^15409001689 is an apocalyptic number.

15409001689 is the 124133-rd square number.

15409001689 is the 62067-th centered octagonal number.

It is an amenable number.

15409001689 is a deficient number, since it is larger than the sum of its proper divisors (124134).

15409001689 is an frugal number, since it uses more digits than its factorization.

15409001689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248266 (or 124133 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The spelling of 15409001689 in words is "fifteen billion, four hundred nine million, one thousand, six hundred eighty-nine".