1287532743025 has 27 divisors (see below), whose sum is σ = 1605162577473. Its totient is φ = 1024493421600.

The previous prime is 1287532742983. The next prime is 1287532743061. The reversal of 1287532743025 is 5203472357821.

The square root of 1287532743025 is 1134695.

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 175722771249 + 1111809971776 = 419193^2 + 1054424^2 .

It is not a de Polignac number, because 1287532743025 - 2⁹ = 1287532742513 is a prime.

It is a super-2 number, since 2×1287532743025² (a number of 25 digits) contains 22 as substring.

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 1287532743025.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1299225280 + ... + 1299226270.

Almost surely, 2^{1287532743025} is an apocalyptic number.

1287532743025 is the 1134695-th square number.

1287532743025 is the 567348-th centered octagonal number.

It is an amenable number.

1287532743025 is a deficient number, since it is larger than the sum of its proper divisors (317629834448).

1287532743025 is an frugal number, since it uses more digits than its factorization.

1287532743025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2450 (or 1225 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 49.

Multiplying 1287532743025 by its sum of digits (49), we get a square (63089104408225 = 7942865²).

The spelling of 1287532743025 in words is "one trillion, two hundred eighty-seven billion, five hundred thirty-two million, seven hundred forty-three thousand, twenty-five".