1211522115 has 16 divisors (see below), whose sum is σ = 1939120128. Its totient is φ = 645916896.

The previous prime is 1211522087. The next prime is 1211522173. The reversal of 1211522115 is 5112251121.

It is not a de Polignac number, because 1211522115 - 2⁵ = 1211522083 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211522091 and 1211522100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35134 + ... + 60476.

It is an arithmetic number, because the mean of its divisors is an integer number (121195008).

Almost surely, 2^1211522115 is an apocalyptic number.

1211522115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1211522115 is a deficient number, since it is larger than the sum of its proper divisors (727598013).

1211522115 is a wasteful number, since it uses less digits than its factorization.

1211522115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28538.

The product of its digits is 200, while the sum is 21.

The square root of 1211522115 is about 34806.9262503887. The cubic root of 1211522115 is about 1066.0488729944.

Adding to 1211522115 its reverse (5112251121), we get a palindrome (6323773236).

The spelling of 1211522115 in words is "one billion, two hundred eleven million, five hundred twenty-two thousand, one hundred fifteen".