1206221551 has 8 divisors (see below), whose sum is σ = 1217777184. Its totient is φ = 1194681600.

The previous prime is 1206221537. The next prime is 1206221581. The reversal of 1206221551 is 1551226021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1206221551 - 2²³ = 1197832943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206221531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200550 + ... + 206476.

It is an arithmetic number, because the mean of its divisors is an integer number (152222148).

Almost surely, 2^1206221551 is an apocalyptic number.

1206221551 is a deficient number, since it is larger than the sum of its proper divisors (11555633).

1206221551 is a wasteful number, since it uses less digits than its factorization.

1206221551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7841.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1206221551 is about 34730.7004104438. The cubic root of 1206221551 is about 1064.4919001352.

Adding to 1206221551 its reverse (1551226021), we get a palindrome (2757447572).

The spelling of 1206221551 in words is "one billion, two hundred six million, two hundred twenty-one thousand, five hundred fifty-one".