1261881 has 12 divisors (see below), whose sum is σ = 1836900. Its totient is φ = 834720.

The previous prime is 1261861. The next prime is 1261889. The reversal of 1261881 is 1881621.

It can be written as a sum of positive squares in 2 ways, for example, as 435600 + 826281 = 660^2 + 909^2 .

It is not a de Polignac number, because 1261881 - 2¹³ = 1253689 is a prime.

It is a super-2 number, since 2×1261881² = 3184687316322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1261889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 871 + ... + 1811.

It is an arithmetic number, because the mean of its divisors is an integer number (153075).

2^1261881 is an apocalyptic number.

It is an amenable number.

1261881 is a deficient number, since it is larger than the sum of its proper divisors (575019).

1261881 is a wasteful number, since it uses less digits than its factorization.

1261881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096 (or 1093 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 1261881 is about 1123.3347675560. The cubic root of 1261881 is about 108.0619500546.

The spelling of 1261881 in words is "one million, two hundred sixty-one thousand, eight hundred eighty-one".