1211043155 has 16 divisors (see below), whose sum is σ = 1669473984. Its totient is φ = 826122240.

The previous prime is 1211043133. The next prime is 1211043167. The reversal of 1211043155 is 5513401121.

It is not a de Polignac number, because 1211043155 - 2⁶ = 1211043091 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 1211043155.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82886 + ... + 96395.

It is an arithmetic number, because the mean of its divisors is an integer number (104342124).

Almost surely, 2^1211043155 is an apocalyptic number.

1211043155 is a deficient number, since it is larger than the sum of its proper divisors (458430829).

1211043155 is a wasteful number, since it uses less digits than its factorization.

1211043155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179486.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1211043155 is about 34800.0453304302. The cubic root of 1211043155 is about 1065.9083714819.

Adding to 1211043155 its reverse (5513401121), we get a palindrome (6724444276).

The spelling of 1211043155 in words is "one billion, two hundred eleven million, forty-three thousand, one hundred fifty-five".