1551312100 has 72 divisors (see below), whose sum is σ = 3637081448. Its totient is φ = 570931200.

The previous prime is 1551312083. The next prime is 1551312143. The reversal of 1551312100 is 12131551.

It can be written as a sum of positive squares in 12 ways, for example, as 937461924 + 613850176 = 30618^2 + 24776^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 436330 + ... + 439870.

Almost surely, 2^1551312100 is an apocalyptic number.

1551312100 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 1551312100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1818540724).

1551312100 is an abundant number, since it is smaller than the sum of its proper divisors (2085769348).

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

1551312100 is a wasteful number, since it uses less digits than its factorization.

1551312100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3905 (or 3898 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 1551312100 is about 39386.6995316947. The cubic root of 1551312100 is about 1157.6209913224.

Adding to 1551312100 its reverse (12131551), we get a palindrome (1563443651).

The spelling of 1551312100 in words is "one billion, five hundred fifty-one million, three hundred twelve thousand, one hundred".