1206555251 has 12 divisors (see below), whose sum is σ = 1348699800. Its totient is φ = 1078271040.

The previous prime is 1206555241. The next prime is 1206555269. The reversal of 1206555251 is 1525556021.

It is not a de Polignac number, because 1206555251 - 2¹⁴ = 1206538867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1206555221) 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 11 ways as a sum of consecutive naturals, for example, 77366 + ... + 91643.

It is an arithmetic number, because the mean of its divisors is an integer number (112391650).

Almost surely, 2^1206555251 is an apocalyptic number.

1206555251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1206555251 is a deficient number, since it is larger than the sum of its proper divisors (142144549).

1206555251 is a wasteful number, since it uses less digits than its factorization.

1206555251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169090 (or 169079 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 32.

The square root of 1206555251 is about 34735.5041851993. The cubic root of 1206555251 is about 1064.5900546283.

The spelling of 1206555251 in words is "one billion, two hundred six million, five hundred fifty-five thousand, two hundred fifty-one".