1551612228 has 12 divisors (see below), whose sum is σ = 3620428560. Its totient is φ = 517204072.

The previous prime is 1551612173. The next prime is 1551612229. The reversal of 1551612228 is 8222161551.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1551612229) 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 3 ways as a sum of consecutive naturals, for example, 64650498 + ... + 64650521.

It is an arithmetic number, because the mean of its divisors is an integer number (301702380).

Almost surely, 2^1551612228 is an apocalyptic number.

It is an amenable number.

1551612228 is an abundant number, since it is smaller than the sum of its proper divisors (2068816332).

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

1551612228 is a wasteful number, since it uses less digits than its factorization.

1551612228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129301026 (or 129301024 counting only the distinct ones).

The product of its digits is 9600, while the sum is 33.

The square root of 1551612228 is about 39390.5093645665. The cubic root of 1551612228 is about 1157.6956404037.

Adding to 1551612228 its reverse (8222161551), we get a palindrome (9773773779).

The spelling of 1551612228 in words is "one billion, five hundred fifty-one million, six hundred twelve thousand, two hundred twenty-eight".