1261569 has 8 divisors (see below), whose sum is σ = 1690912. Its totient is φ = 836640.

The previous prime is 1261567. The next prime is 1261571. The reversal of 1261569 is 9651621.

It is an interprime number because it is at equal distance from previous prime (1261567) and next prime (1261571).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1261569 - 2¹ = 1261567 is a prime.

It is a super-2 number, since 2×1261569² = 3183112683522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon 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 (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364 + ... + 1629.

It is an arithmetic number, because the mean of its divisors is an integer number (211364).

It is a Proth number, since it is equal to 77 ⋅ 2¹⁴ + 1 and 77 < 2¹⁴.

2^1261569 is an apocalyptic number.

It is an amenable number.

1261569 is a deficient number, since it is larger than the sum of its proper divisors (429343).

1261569 is a wasteful number, since it uses less digits than its factorization.

1261569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207.

The product of its digits is 3240, while the sum is 30.

The square root of 1261569 is about 1123.1958867446. The cubic root of 1261569 is about 108.0530432170.

It can be divided in two parts, 1261 and 569, that added together give a triangular number (1830 = T₆₀).

The spelling of 1261569 in words is "one million, two hundred sixty-one thousand, five hundred sixty-nine".