1212551550 has 216 divisors, whose sum is σ = 3828254976. Its totient is φ = 274337280.

The previous prime is 1212551533. The next prime is 1212551551. The reversal of 1212551550 is 551552121.

1212551550 is a `hidden beast` number, since 121 + 25 + 515 + 5 + 0 = 666.

It is a super-2 number, since 2×1212551550² = 2940562522814805000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212551551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 2800134 + ... + 2800566.

Almost surely, 2^1212551550 is an apocalyptic number.

1212551550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212551550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1914127488).

1212551550 is an abundant number, since it is smaller than the sum of its proper divisors (2615703426).

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

1212551550 is a wasteful number, since it uses less digits than its factorization.

1212551550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The square root of 1212551550 is about 34821.7108999544. The cubic root of 1212551550 is about 1066.3507294566.

The spelling of 1212551550 in words is "one billion, two hundred twelve million, five hundred fifty-one thousand, five hundred fifty".