1298754257641 has 27 divisors (see below), whose sum is σ = 1413383059191. Its totient is φ = 1193164211904.

The previous prime is 1298754257639. The next prime is 1298754257657. The reversal of 1298754257641 is 1467524578921.

The square root of 1298754257641 is 1139629.

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., 1011140858025 + 287613399616 = 1005555^2 + 536296^2 .

It is not a de Polignac number, because 1298754257641 - 2¹ = 1298754257639 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 1298754257641.

It is not an unprimeable number, because it can be changed into a prime (1298754257621) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 833068020 + ... + 833069578.

Almost surely, 2^{1298754257641} is an apocalyptic number.

1298754257641 is the 1139629-th square number.

1298754257641 is the 569815-th centered octagonal number.

It is an amenable number.

1298754257641 is a deficient number, since it is larger than the sum of its proper divisors (114628801550).

1298754257641 is an frugal number, since it uses more digits than its factorization.

1298754257641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238 (or 1619 counting only the distinct ones).

The product of its digits is 33868800, while the sum is 61.

The spelling of 1298754257641 in words is "one trillion, two hundred ninety-eight billion, seven hundred fifty-four million, two hundred fifty-seven thousand, six hundred forty-one".