1252221155 has 16 divisors (see below), whose sum is σ = 1545504384. Its totient is φ = 973296000.

The previous prime is 1252221151. The next prime is 1252221193. The reversal of 1252221155 is 5511222521.

It is a happy number.

1252221155 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1252221155 - 2² = 1252221151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252221151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134429 + ... + 143441.

It is an arithmetic number, because the mean of its divisors is an integer number (96594024).

Almost surely, 2^1252221155 is an apocalyptic number.

1252221155 is a deficient number, since it is larger than the sum of its proper divisors (293283229).

1252221155 is an equidigital number, since it uses as much as digits as its factorization.

1252221155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9806.

The product of its digits is 2000, while the sum is 26.

The square root of 1252221155 is about 35386.7369928339. The cubic root of 1252221155 is about 1077.8550119209.

Adding to 1252221155 its reverse (5511222521), we get a palindrome (6763443676).

The spelling of 1252221155 in words is "one billion, two hundred fifty-two million, two hundred twenty-one thousand, one hundred fifty-five".