1261587 has 16 divisors (see below), whose sum is σ = 1844640. Its totient is φ = 763392.

The previous prime is 1261571. The next prime is 1261627. The reversal of 1261587 is 7851621.

It is not a de Polignac number, because 1261587 - 2⁴ = 1261571 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1053 + ... + 1905.

It is an arithmetic number, because the mean of its divisors is an integer number (115290).

2^1261587 is an apocalyptic number.

1261587 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1261587 is a deficient number, since it is larger than the sum of its proper divisors (583053).

1261587 is a wasteful number, since it uses less digits than its factorization.

1261587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902.

The product of its digits is 3360, while the sum is 30.

The square root of 1261587 is about 1123.2038995659. The cubic root of 1261587 is about 108.0535571129.

The spelling of 1261587 in words is "one million, two hundred sixty-one thousand, five hundred eighty-seven".