1226195231569 has 81 divisors (see below), whose sum is σ = 1597732298001. Its totient is φ = 937604384640.

The previous prime is 1226195231567. The next prime is 1226195231587. The reversal of 1226195231569 is 9651325916221.

The square root of 1226195231569 is 1107337.

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

It can be written as a sum of positive squares in 4 ways, for example, as 521770741569 + 704424490000 = 722337^2 + 839300^2 .

It is not a de Polignac number, because 1226195231569 - 2¹ = 1226195231567 is a prime.

It is a super-2 number, since 2×1226195231569² (a number of 25 digits) contains 22 as substring.

Its product of digits (1749600) is a multiple of the sum of its prime divisors (288).

It is not an unprimeable number, because it can be changed into a prime (1226195231567) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 6224341179 + ... + 6224341375.

Almost surely, 2^{1226195231569} is an apocalyptic number.

1226195231569 is the 1107337-th square number.

1226195231569 is the 553669-th centered octagonal number.

It is an amenable number.

1226195231569 is a deficient number, since it is larger than the sum of its proper divisors (371537066432).

1226195231569 is an frugal number, since it uses more digits than its factorization.

1226195231569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576 (or 288 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 52.

The spelling of 1226195231569 in words is "one trillion, two hundred twenty-six billion, one hundred ninety-five million, two hundred thirty-one thousand, five hundred sixty-nine".