1211150155 has 16 divisors (see below), whose sum is σ = 1531723680. Its totient is φ = 916814592.

The previous prime is 1211150153. The next prime is 1211150167. The reversal of 1211150155 is 5510511121.

It is a cyclic number.

It is not a de Polignac number, because 1211150155 - 2¹ = 1211150153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211150153) 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, 76047 + ... + 90583.

It is an arithmetic number, because the mean of its divisors is an integer number (95732730).

Almost surely, 2^1211150155 is an apocalyptic number.

1211150155 is a deficient number, since it is larger than the sum of its proper divisors (320573525).

1211150155 is a wasteful number, since it uses less digits than its factorization.

1211150155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15438.

The product of its (nonzero) digits is 250, while the sum is 22.

The square root of 1211150155 is about 34801.5826507933. The cubic root of 1211150155 is about 1065.9397628314.

Adding to 1211150155 its reverse (5510511121), we get a palindrome (6721661276).

The spelling of 1211150155 in words is "one billion, two hundred eleven million, one hundred fifty thousand, one hundred fifty-five".