1212281 has 4 divisors (see below), whose sum is σ = 1385472. Its totient is φ = 1039092.

The previous prime is 1212259. The next prime is 1212283. The reversal of 1212281 is 1822121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1212281 - 2¹⁴ = 1195897 is a prime.

It is a super-2 number, since 2×1212281² = 2939250445922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1212283) 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, 86585 + ... + 86598.

It is an arithmetic number, because the mean of its divisors is an integer number (346368).

2^1212281 is an apocalyptic number.

It is an amenable number.

1212281 is a deficient number, since it is larger than the sum of its proper divisors (173191).

1212281 is an equidigital number, since it uses as much as digits as its factorization.

1212281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173190.

The product of its digits is 64, while the sum is 17.

The square root of 1212281 is about 1101.0363300091. The cubic root of 1212281 is about 106.6271413887.

The spelling of 1212281 in words is "one million, two hundred twelve thousand, two hundred eighty-one".