1220561297 has 8 divisors (see below), whose sum is σ = 1237875840. Its totient is φ = 1203293520.

The previous prime is 1220561281. The next prime is 1220561299. The reversal of 1220561297 is 7921650221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220561297 - 2⁴ = 1220561281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220561299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42647 + ... + 65267.

It is an arithmetic number, because the mean of its divisors is an integer number (154734480).

Almost surely, 2^1220561297 is an apocalyptic number.

It is an amenable number.

1220561297 is a deficient number, since it is larger than the sum of its proper divisors (17314543).

1220561297 is an equidigital number, since it uses as much as digits as its factorization.

1220561297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23383.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1220561297 is about 34936.5324123617. The cubic root of 1220561297 is about 1068.6935745685.

The spelling of 1220561297 in words is "one billion, two hundred twenty million, five hundred sixty-one thousand, two hundred ninety-seven".