1491478441525 has 12 divisors (see below), whose sum is σ = 1849555515712. Its totient is φ = 1193103883440.

The previous prime is 1491478441511. The next prime is 1491478441543. The reversal of 1491478441525 is 5251448741941.

It is a de Polignac number, because none of the positive numbers 2^k-1491478441525 is a prime.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1584477 + ... + 2343826.

Almost surely, 2^{1491478441525} is an apocalyptic number.

It is an amenable number.

1491478441525 is a deficient number, since it is larger than the sum of its proper divisors (358077074187).

1491478441525 is a wasteful number, since it uses less digits than its factorization.

1491478441525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3943500 (or 3943495 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 55.

The spelling of 1491478441525 in words is "one trillion, four hundred ninety-one billion, four hundred seventy-eight million, four hundred forty-one thousand, five hundred twenty-five".