1212780625 has 45 divisors (see below), whose sum is σ = 1771821117. Its totient is φ = 827442000.

The previous prime is 1212780623. The next prime is 1212780631. The reversal of 1212780625 is 5260872121.

It is a happy number.

The square root of 1212780625 is 34825.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 95082001 + 1117698624 = 9751^2 + 33432^2 .

It is not a de Polignac number, because 1212780625 - 2¹ = 1212780623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212780623) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 6094276 + ... + 6094474.

Almost surely, 2^1212780625 is an apocalyptic number.

1212780625 is the 34825-th square number.

1212780625 is the 17413-rd centered octagonal number.

It is an amenable number.

1212780625 is a deficient number, since it is larger than the sum of its proper divisors (559040492).

1212780625 is an frugal number, since it uses more digits than its factorization.

1212780625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The cubic root of 1212780625 is about 1066.4178768182.

The spelling of 1212780625 in words is "one billion, two hundred twelve million, seven hundred eighty thousand, six hundred twenty-five".