1211502025 has 24 divisors (see below), whose sum is σ = 1596694680. Its totient is φ = 908712960.

The previous prime is 1211501987. The next prime is 1211502031. The reversal of 1211502025 is 5202051121.

It can be written as a sum of positive squares in 12 ways, for example, as 805197376 + 406304649 = 28376^2 + 20157^2 .

It is not a de Polignac number, because 1211502025 - 2¹⁵ = 1211469257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211501993 and 1211502011.

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 23 ways as a sum of consecutive naturals, for example, 109027 + ... + 119623.

It is an arithmetic number, because the mean of its divisors is an integer number (66528945).

Almost surely, 2^1211502025 is an apocalyptic number.

It is an amenable number.

1211502025 is a deficient number, since it is larger than the sum of its proper divisors (385192655).

1211502025 is a wasteful number, since it uses less digits than its factorization.

1211502025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10893 (or 10888 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 1211502025 is about 34806.6376572056. The cubic root of 1211502025 is about 1066.0429803959.

Adding to 1211502025 its reverse (5202051121), we get a palindrome (6413553146).

The spelling of 1211502025 in words is "one billion, two hundred eleven million, five hundred two thousand, twenty-five".