1233256891441 has 3 divisors (see below), whose sum is σ = 1233258001963. Its totient is φ = 1233255780920.

The previous prime is 1233256891423. The next prime is 1233256891511. The reversal of 1233256891441 is 1441986523321.

The square root of 1233256891441 is 1110521.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1152464513841 + 80792377600 = 1073529^2 + 284240^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1233256891441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1233256891421) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 555261 + ... + 1665781.

Almost surely, 2^{1233256891441} is an apocalyptic number.

1233256891441 is the 1110521-st square number.

1233256891441 is the 555261-st centered octagonal number.

It is an amenable number.

1233256891441 is a deficient number, since it is larger than the sum of its proper divisors (1110522).

1233256891441 is an frugal number, since it uses more digits than its factorization.

1233256891441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221042 (or 1110521 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

Multiplying 1233256891441 by its sum of digits (49), we get a square (60429587680609 = 7773647²).

The spelling of 1233256891441 in words is "one trillion, two hundred thirty-three billion, two hundred fifty-six million, eight hundred ninety-one thousand, four hundred forty-one".