1151221055 has 8 divisors (see below), whose sum is σ = 1410858432. Its totient is φ = 901381408.

The previous prime is 1151221037. The next prime is 1151221063. The reversal of 1151221055 is 5501221511.

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 1151221055 - 2⁸ = 1151220799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1151221055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2449172 + ... + 2449641.

It is an arithmetic number, because the mean of its divisors is an integer number (176357304).

Almost surely, 2^1151221055 is an apocalyptic number.

1151221055 is a deficient number, since it is larger than the sum of its proper divisors (259637377).

1151221055 is an equidigital number, since it uses as much as digits as its factorization.

1151221055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4898865.

The product of its (nonzero) digits is 500, while the sum is 23.

The square root of 1151221055 is about 33929.6486129756. The cubic root of 1151221055 is about 1048.0602297101.

Adding to 1151221055 its reverse (5501221511), we get a palindrome (6652442566).

The spelling of 1151221055 in words is "one billion, one hundred fifty-one million, two hundred twenty-one thousand, fifty-five".