1220751 has 20 divisors (see below), whose sum is σ = 2085072. Its totient is φ = 697248.

The previous prime is 1220743. The next prime is 1220761. The reversal of 1220751 is 1570221.

It is not a de Polignac number, because 1220751 - 2³ = 1220743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220711) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 510 + ... + 1643.

2^1220751 is an apocalyptic number.

1220751 is a deficient number, since it is larger than the sum of its proper divisors (864321).

1220751 is an equidigital number, since it uses as much as digits as its factorization.

1220751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172 (or 2163 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 1220751 is about 1104.8760111433. The cubic root of 1220751 is about 106.8748938134.

Adding to 1220751 its reverse (1570221), we get a palindrome (2790972).

The spelling of 1220751 in words is "one million, two hundred twenty thousand, seven hundred fifty-one".