1211440125 has 64 divisors (see below), whose sum is σ = 2366267904. Its totient is φ = 538790400.

The previous prime is 1211440123. The next prime is 1211440147. The reversal of 1211440125 is 5210441121.

It is not a de Polignac number, because 1211440125 - 2¹ = 1211440123 is a prime.

It is a super-3 number, since 3×1211440125³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211440123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 90889 + ... + 103361.

It is an arithmetic number, because the mean of its divisors is an integer number (36972936).

Almost surely, 2^1211440125 is an apocalyptic number.

1211440125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211440125 is a deficient number, since it is larger than the sum of its proper divisors (1154827779).

1211440125 is a wasteful number, since it uses less digits than its factorization.

1211440125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12535 (or 12525 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1211440125 is about 34805.7484476343. The cubic root of 1211440125 is about 1066.0248240954.

Adding to 1211440125 its reverse (5210441121), we get a palindrome (6421881246).

The spelling of 1211440125 in words is "one billion, two hundred eleven million, four hundred forty thousand, one hundred twenty-five".