1225770121 has 9 divisors (see below), whose sum is σ = 1239184071. Its totient is φ = 1212500952.

The previous prime is 1225770097. The next prime is 1225770157. The reversal of 1225770121 is 1210775221.

The square root of 1225770121 is 35011.

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

It can be written as a sum of positive squares in only one way, i.e., 359292025 + 866478096 = 18955^2 + 29436^2 .

It is not a de Polignac number, because 1225770121 - 2²¹ = 1223672969 is a prime.

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 1225770121.

It is not an unprimeable number, because it can be changed into a prime (1225770181) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 5496616 + ... + 5496838.

It is an arithmetic number, because the mean of its divisors is an integer number (137687119).

Almost surely, 2^1225770121 is an apocalyptic number.

1225770121 is the 35011-st square number.

1225770121 is the 17506-th centered octagonal number.

It is an amenable number.

1225770121 is a deficient number, since it is larger than the sum of its proper divisors (13413950).

1225770121 is an frugal number, since it uses more digits than its factorization.

1225770121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 28.

The cubic root of 1225770121 is about 1070.2116566766.

The spelling of 1225770121 in words is "one billion, two hundred twenty-five million, seven hundred seventy thousand, one hundred twenty-one".