1265881 has 4 divisors (see below), whose sum is σ = 1300132. Its totient is φ = 1231632.

The previous prime is 1265867. The next prime is 1265899. The reversal of 1265881 is 1885621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1885621 = 103 ⋅18307.

It can be written as a sum of positive squares in 2 ways, for example, as 1121481 + 144400 = 1059^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265881 - 2¹³ = 1257689 is a prime.

It is a super-2 number, since 2×1265881² = 3204909412322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17070 + ... + 17143.

It is an arithmetic number, because the mean of its divisors is an integer number (325033).

2^1265881 is an apocalyptic number.

It is an amenable number.

1265881 is a deficient number, since it is larger than the sum of its proper divisors (34251).

1265881 is an equidigital number, since it uses as much as digits as its factorization.

1265881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34250.

The product of its digits is 3840, while the sum is 31.

The square root of 1265881 is about 1125.1137720249. The cubic root of 1265881 is about 108.1760104348.

The spelling of 1265881 in words is "one million, two hundred sixty-five thousand, eight hundred eighty-one".