1550209135 has 4 divisors (see below), whose sum is σ = 1860250968. Its totient is φ = 1240167304.

The previous prime is 1550209121. The next prime is 1550209151. The reversal of 1550209135 is 5319020551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5319020551 = 13 ⋅409155427.

It is a cyclic number.

It is not a de Polignac number, because 1550209135 - 2⁵ = 1550209103 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1550209097 and 1550209106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155020909 + ... + 155020918.

It is an arithmetic number, because the mean of its divisors is an integer number (465062742).

Almost surely, 2^1550209135 is an apocalyptic number.

1550209135 is a deficient number, since it is larger than the sum of its proper divisors (310041833).

1550209135 is an equidigital number, since it uses as much as digits as its factorization.

1550209135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310041832.

The product of its (nonzero) digits is 6750, while the sum is 31.

The square root of 1550209135 is about 39372.6952976298. The cubic root of 1550209135 is about 1157.3465745546.

Adding to 1550209135 its reverse (5319020551), we get a palindrome (6869229686).

The spelling of 1550209135 in words is "one billion, five hundred fifty million, two hundred nine thousand, one hundred thirty-five".