1211541045 has 64 divisors (see below), whose sum is σ = 2320545024. Its totient is φ = 531947520.

The previous prime is 1211541017. The next prime is 1211541047. The reversal of 1211541045 is 5401451121.

It is not a de Polignac number, because 1211541045 - 2⁵ = 1211541013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211541047) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 108357 + ... + 119013.

It is an arithmetic number, because the mean of its divisors is an integer number (36258516).

Almost surely, 2^1211541045 is an apocalyptic number.

1211541045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211541045 is a deficient number, since it is larger than the sum of its proper divisors (1109003979).

1211541045 is a wasteful number, since it uses less digits than its factorization.

1211541045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10742.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 1211541045 is about 34807.1981779631. The cubic root of 1211541045 is about 1066.0544252937.

Adding to 1211541045 its reverse (5401451121), we get a palindrome (6612992166).

The spelling of 1211541045 in words is "one billion, two hundred eleven million, five hundred forty-one thousand, forty-five".