1211135145 has 48 divisors (see below), whose sum is σ = 2231209152. Its totient is φ = 556283520.

The previous prime is 1211135099. The next prime is 1211135153. The reversal of 1211135145 is 5415311121.

It is not a de Polignac number, because 1211135145 - 2⁸ = 1211134889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49399 + ... + 69731.

It is an arithmetic number, because the mean of its divisors is an integer number (46483524).

Almost surely, 2^1211135145 is an apocalyptic number.

1211135145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211135145 is a deficient number, since it is larger than the sum of its proper divisors (1020074007).

1211135145 is a wasteful number, since it uses less digits than its factorization.

1211135145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20390 (or 20371 counting only the distinct ones).

The product of its digits is 600, while the sum is 24.

The square root of 1211135145 is about 34801.3669990131. The cubic root of 1211135145 is about 1065.9353593527.

Adding to 1211135145 its reverse (5415311121), we get a palindrome (6626446266).

The spelling of 1211135145 in words is "one billion, two hundred eleven million, one hundred thirty-five thousand, one hundred forty-five".