1212881 has 4 divisors (see below), whose sum is σ = 1219764. Its totient is φ = 1206000.

The previous prime is 1212877. The next prime is 1212889. The reversal of 1212881 is 1882121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 180625 + 1032256 = 425^2 + 1016^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212881 - 2² = 1212877 is a prime.

It is a super-2 number, since 2×1212881² = 2942160640322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212889) 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, 3170 + ... + 3531.

It is an arithmetic number, because the mean of its divisors is an integer number (304941).

2^1212881 is an apocalyptic number.

It is an amenable number.

1212881 is a deficient number, since it is larger than the sum of its proper divisors (6883).

1212881 is an equidigital number, since it uses as much as digits as its factorization.

1212881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6882.

The product of its digits is 256, while the sum is 23.

The square root of 1212881 is about 1101.3087668769. The cubic root of 1212881 is about 106.6447296467.

The spelling of 1212881 in words is "one million, two hundred twelve thousand, eight hundred eighty-one".