1289471531401 has 9 divisors (see below), whose sum is σ = 1369805144149. Its totient is φ = 1213602096064.

The previous prime is 1289471531399. The next prime is 1289471531431. The reversal of 1289471531401 is 1041351749821.

The square root of 1289471531401 is 1135549.

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 111281401 + 1289360250000 = 10549^2 + 1135500^2 .

It is not a de Polignac number, because 1289471531401 - 2¹ = 1289471531399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1289471531431) 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, 19270935 + ... + 19337731.

Almost surely, 2^{1289471531401} is an apocalyptic number.

1289471531401 is the 1135549-th square number.

1289471531401 is the 567775-th centered octagonal number.

It is an amenable number.

1289471531401 is a deficient number, since it is larger than the sum of its proper divisors (80333612748).

1289471531401 is an frugal number, since it uses more digits than its factorization.

1289471531401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133628 (or 66814 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 1289471531401 in words is "one trillion, two hundred eighty-nine billion, four hundred seventy-one million, five hundred thirty-one thousand, four hundred one".