1251551304120 has 128 divisors (see below), whose sum is σ = 4081263459840. Its totient is φ = 305194928640.

The previous prime is 1251551304061. The next prime is 1251551304127. The reversal of 1251551304120 is 214031551521.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251551304127) 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 31 ways as a sum of consecutive naturals, for example, 3582036 + ... + 3915875.

It is an arithmetic number, because the mean of its divisors is an integer number (31884870780).

Almost surely, 2^{1251551304120} is an apocalyptic number.

1251551304120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251551304120 is an abundant number, since it is smaller than the sum of its proper divisors (2829712155720).

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

1251551304120 is a wasteful number, since it uses less digits than its factorization.

1251551304120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7498045 (or 7498041 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 30.

Adding to 1251551304120 its reverse (214031551521), we get a palindrome (1465582855641).

The spelling of 1251551304120 in words is "one trillion, two hundred fifty-one billion, five hundred fifty-one million, three hundred four thousand, one hundred twenty".