1221144523 has 2 divisors, whose sum is σ = 1221144524. Its totient is φ = 1221144522.

The previous prime is 1221144503. The next prime is 1221144541. The reversal of 1221144523 is 3254411221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221144523 - 2²¹ = 1219047371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221144503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610572261 + 610572262.

It is an arithmetic number, because the mean of its divisors is an integer number (610572262).

Almost surely, 2^1221144523 is an apocalyptic number.

1221144523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221144523 is an equidigital number, since it uses as much as digits as its factorization.

1221144523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 25.

The square root of 1221144523 is about 34944.8783514838. The cubic root of 1221144523 is about 1068.8637669301.

Adding to 1221144523 its reverse (3254411221), we get a palindrome (4475555744).

The spelling of 1221144523 in words is "one billion, two hundred twenty-one million, one hundred forty-four thousand, five hundred twenty-three".