1211251143 has 16 divisors (see below), whose sum is σ = 1630160000. Its totient is φ = 799947360.

The previous prime is 1211251141. The next prime is 1211251157. The reversal of 1211251143 is 3411521121.

It is not a de Polignac number, because 1211251143 - 2¹ = 1211251141 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 (1211251141) 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, 205173 + ... + 210993.

It is an arithmetic number, because the mean of its divisors is an integer number (101885000).

Almost surely, 2^1211251143 is an apocalyptic number.

1211251143 is a deficient number, since it is larger than the sum of its proper divisors (418908857).

1211251143 is a wasteful number, since it uses less digits than its factorization.

1211251143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462.

The product of its digits is 240, while the sum is 21.

The square root of 1211251143 is about 34803.0335315760. The cubic root of 1211251143 is about 1065.9693887019.

Adding to 1211251143 its reverse (3411521121), we get a palindrome (4622772264).

The spelling of 1211251143 in words is "one billion, two hundred eleven million, two hundred fifty-one thousand, one hundred forty-three".