1223021445409 has 9 divisors (see below), whose sum is σ = 1225431521587. Its totient is φ = 1220616106384.

The previous prime is 1223021445389. The next prime is 1223021445449. The reversal of 1223021445409 is 9045441203221.

The square root of 1223021445409 is 1105903.

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., 1076516227809 + 146505217600 = 1037553^2 + 382760^2 .

It is not a de Polignac number, because 1223021445409 - 2¹¹ = 1223021443361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223021445449) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 894674844 + ... + 894676210.

Almost surely, 2^{1223021445409} is an apocalyptic number.

1223021445409 is the 1105903-rd square number.

1223021445409 is the 552952-nd centered octagonal number.

It is an amenable number.

1223021445409 is a deficient number, since it is larger than the sum of its proper divisors (2410076178).

1223021445409 is an frugal number, since it uses more digits than its factorization.

1223021445409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4352 (or 2176 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 1223021445409 in words is "one trillion, two hundred twenty-three billion, twenty-one million, four hundred forty-five thousand, four hundred nine".