1260479989521 has 27 divisors (see below), whose sum is σ = 1852367597769. Its totient is φ = 825947046792.

The previous prime is 1260479989459. The next prime is 1260479989541. The reversal of 1260479989521 is 1259899740621.

The square root of 1260479989521 is 1122711.

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

1260479989521 is a `hidden beast` number, since 1 + 2 + 60 + 47 + 9 + 9 + 8 + 9 + 521 = 666.

It is not a de Polignac number, because 1260479989521 - 2²⁵ = 1260446435089 is a prime.

It is a super-3 number, since 3×1260479989521³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1260479989541) 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, 198716676 + ... + 198723018.

Almost surely, 2^{1260479989521} is an apocalyptic number.

1260479989521 is the 1122711-st square number.

1260479989521 is the 561356-th centered octagonal number.

It is an amenable number.

1260479989521 is a deficient number, since it is larger than the sum of its proper divisors (591887608248).

1260479989521 is an frugal number, since it uses more digits than its factorization.

1260479989521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12810 (or 6405 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

It can be divided in two parts, 1260479 and 989521, that added together give a square (2250000 = 1500²).

The spelling of 1260479989521 in words is "one trillion, two hundred sixty billion, four hundred seventy-nine million, nine hundred eighty-nine thousand, five hundred twenty-one".