1221444151 has 2 divisors, whose sum is σ = 1221444152. Its totient is φ = 1221444150.

The previous prime is 1221444109. The next prime is 1221444163. The reversal of 1221444151 is 1514441221.

It is a strong prime.

It is an emirp because it is prime and its reverse (1514441221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221444151 - 2²⁵ = 1187889719 is a prime.

It is a super-2 number, since 2×1221444151² = 2983851628024221602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221444181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610722075 + 610722076.

It is an arithmetic number, because the mean of its divisors is an integer number (610722076).

Almost surely, 2^1221444151 is an apocalyptic number.

1221444151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221444151 is an equidigital number, since it uses as much as digits as its factorization.

1221444151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1280, while the sum is 25.

The square root of 1221444151 is about 34949.1652403888. The cubic root of 1221444151 is about 1068.9511809138.

Adding to 1221444151 its reverse (1514441221), we get a palindrome (2735885372).

It can be divided in two parts, 12214 and 44151, that added together give a palindrome (56365).

The spelling of 1221444151 in words is "one billion, two hundred twenty-one million, four hundred forty-four thousand, one hundred fifty-one".