1220851 has 4 divisors (see below), whose sum is σ = 1230592. Its totient is φ = 1211112.

The previous prime is 1220839. The next prime is 1220893. The reversal of 1220851 is 1580221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1580221 = 479 ⋅3299.

It is a cyclic number.

It is not a de Polignac number, because 1220851 - 2⁵ = 1220819 is a prime.

It is a Duffinian number.

1220851 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1220801) 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, 4680 + ... + 4933.

It is an arithmetic number, because the mean of its divisors is an integer number (307648).

2^1220851 is an apocalyptic number.

1220851 is a deficient number, since it is larger than the sum of its proper divisors (9741).

1220851 is an equidigital number, since it uses as much as digits as its factorization.

1220851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9740.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1220851 is about 1104.9212641632. The cubic root of 1220851 is about 106.8778120163.

The spelling of 1220851 in words is "one million, two hundred twenty thousand, eight hundred fifty-one".