1550405117 has 16 divisors (see below), whose sum is σ = 1689143472. Its totient is φ = 1417098240.

The previous prime is 1550405113. The next prime is 1550405159. The reversal of 1550405117 is 7115040551.

It can be written as a sum of positive squares in 8 ways, for example, as 101384761 + 1449020356 = 10069^2 + 38066^2 .

It is not a de Polignac number, because 1550405117 - 2² = 1550405113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1550405117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1550405113) 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 15 ways as a sum of consecutive naturals, for example, 383567 + ... + 387587.

It is an arithmetic number, because the mean of its divisors is an integer number (105571467).

Almost surely, 2^1550405117 is an apocalyptic number.

1550405117 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1550405117 is a deficient number, since it is larger than the sum of its proper divisors (138738355).

1550405117 is a wasteful number, since it uses less digits than its factorization.

1550405117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4688.

The product of its (nonzero) digits is 3500, while the sum is 29.

The square root of 1550405117 is about 39375.1840249668. The cubic root of 1550405117 is about 1157.3953442192.

Adding to 1550405117 its reverse (7115040551), we get a palindrome (8665445668).

The spelling of 1550405117 in words is "one billion, five hundred fifty million, four hundred five thousand, one hundred seventeen".