1212240625 has 12 divisors (see below), whose sum is σ = 1515207708. Its totient is φ = 969790000.

The previous prime is 1212240569. The next prime is 1212240637. The reversal of 1212240625 is 5260422121.

It can be written as a sum of positive squares in 6 ways, for example, as 955984561 + 256256064 = 30919^2 + 16008^2 .

It is not a de Polignac number, because 1212240625 - 2¹⁷ = 1212109553 is a prime.

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 1212240625.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190834 + ... + 197083.

It is an arithmetic number, because the mean of its divisors is an integer number (126267309).

Almost surely, 2^1212240625 is an apocalyptic number.

It is an amenable number.

1212240625 is a deficient number, since it is larger than the sum of its proper divisors (302967083).

1212240625 is an frugal number, since it uses more digits than its factorization.

1212240625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387942 (or 387922 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1212240625 is about 34817.2460858121. The cubic root of 1212240625 is about 1066.2595763715.

Adding to 1212240625 its reverse (5260422121), we get a palindrome (6472662746).

The spelling of 1212240625 in words is "one billion, two hundred twelve million, two hundred forty thousand, six hundred twenty-five".