1210661125 has 16 divisors (see below), whose sum is σ = 1513676736. Its totient is φ = 966752400.

The previous prime is 1210661117. The next prime is 1210661129. The reversal of 1210661125 is 5211660121.

It is a happy number.

It is not a de Polignac number, because 1210661125 - 2³ = 1210661117 is a prime.

It is a super-3 number, since 3×1210661125³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1210661125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210661129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61774 + ... + 78976.

It is an arithmetic number, because the mean of its divisors is an integer number (94604796).

Almost surely, 2^1210661125 is an apocalyptic number.

It is an amenable number.

1210661125 is a deficient number, since it is larger than the sum of its proper divisors (303015611).

1210661125 is an equidigital number, since it uses as much as digits as its factorization.

1210661125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17781 (or 17771 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1210661125 is about 34794.5559678522. Note that the first 3 decimals coincide. The cubic root of 1210661125 is about 1065.7962775405.

The spelling of 1210661125 in words is "one billion, two hundred ten million, six hundred sixty-one thousand, one hundred twenty-five".