1550421345 has 48 divisors (see below), whose sum is σ = 2802975552. Its totient is φ = 725733120.

The previous prime is 1550421319. The next prime is 1550421419. The reversal of 1550421345 is 5431240551.

It is not a de Polignac number, because 1550421345 - 2⁷ = 1550421217 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133179 + ... + 144351.

It is an arithmetic number, because the mean of its divisors is an integer number (58395324).

Almost surely, 2^1550421345 is an apocalyptic number.

1550421345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1550421345 is a deficient number, since it is larger than the sum of its proper divisors (1252554207).

1550421345 is a wasteful number, since it uses less digits than its factorization.

1550421345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11250 (or 11221 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 1550421345 is about 39375.3900933057. The cubic root of 1550421345 is about 1157.3993823350.

Adding to 1550421345 its reverse (5431240551), we get a palindrome (6981661896).

The spelling of 1550421345 in words is "one billion, five hundred fifty million, four hundred twenty-one thousand, three hundred forty-five".