1291563 has 48 divisors (see below), whose sum is σ = 2446080. Its totient is φ = 637632.

The previous prime is 1291547. The next prime is 1291567. The reversal of 1291563 is 3651921.

1291563 is a `hidden beast` number, since 12 + 91 + 563 = 666.

It is not a de Polignac number, because 1291563 - 2⁴ = 1291547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1291567) 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, 15520 + ... + 15602.

It is an arithmetic number, because the mean of its divisors is an integer number (50960).

2^1291563 is an apocalyptic number.

1291563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1291563 is a deficient number, since it is larger than the sum of its proper divisors (1154517).

1291563 is a wasteful number, since it uses less digits than its factorization.

1291563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 125 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 1291563 is about 1136.4695332476. The cubic root of 1291563 is about 108.9026710230.

The spelling of 1291563 in words is "one million, two hundred ninety-one thousand, five hundred sixty-three".