1551005020 has 48 divisors (see below), whose sum is σ = 3370364928. Its totient is φ = 598927680.

The previous prime is 1551005009. The next prime is 1551005021. The reversal of 1551005020 is 205001551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551005021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271837 + ... + 277483.

It is an arithmetic number, because the mean of its divisors is an integer number (70215936).

Almost surely, 2^1551005020 is an apocalyptic number.

1551005020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551005020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1685182464).

1551005020 is an abundant number, since it is smaller than the sum of its proper divisors (1819359908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1551005020 is a wasteful number, since it uses less digits than its factorization.

1551005020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6130 (or 6128 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 1551005020 is about 39382.8010684867. The cubic root of 1551005020 is about 1157.5446031448.

Adding to 1551005020 its reverse (205001551), we get a palindrome (1756006571).

The spelling of 1551005020 in words is "one billion, five hundred fifty-one million, five thousand, twenty".