1220653651 has 16 divisors (see below), whose sum is σ = 1498432000. Its totient is φ = 991202184.

The previous prime is 1220653627. The next prime is 1220653729. The reversal of 1220653651 is 1563560221.

It is not a de Polignac number, because 1220653651 - 2⁵ = 1220653619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220653151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87135 + ... + 100168.

It is an arithmetic number, because the mean of its divisors is an integer number (93652000).

Almost surely, 2^1220653651 is an apocalyptic number.

1220653651 is a deficient number, since it is larger than the sum of its proper divisors (277778349).

1220653651 is an equidigital number, since it uses as much as digits as its factorization.

1220653651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187343 (or 187329 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1220653651 is about 34937.8541270067. The cubic root of 1220653651 is about 1068.7205281888.

The spelling of 1220653651 in words is "one billion, two hundred twenty million, six hundred fifty-three thousand, six hundred fifty-one".