1481856561 has 48 divisors (see below), whose sum is σ = 2326641408. Its totient is φ = 905280000.

The previous prime is 1481856557. The next prime is 1481856577. The reversal of 1481856561 is 1656581841.

1481856561 is a `hidden beast` number, since 1 + 4 + 8 + 1 + 85 + 6 + 561 = 666.

It is not a de Polignac number, because 1481856561 - 2² = 1481856557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1481856461) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1804531 + ... + 1805351.

It is an arithmetic number, because the mean of its divisors is an integer number (48471696).

Almost surely, 2^1481856561 is an apocalyptic number.

It is an amenable number.

1481856561 is a deficient number, since it is larger than the sum of its proper divisors (844784847).

1481856561 is a wasteful number, since it uses less digits than its factorization.

1481856561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142 (or 1139 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The square root of 1481856561 is about 38494.8900634876. The cubic root of 1481856561 is about 1140.0801628763.

The spelling of 1481856561 in words is "one billion, four hundred eighty-one million, eight hundred fifty-six thousand, five hundred sixty-one".