1220654441 has 4 divisors (see below), whose sum is σ = 1238873232. Its totient is φ = 1202435652.

The previous prime is 1220654429. The next prime is 1220654443. The reversal of 1220654441 is 1444560221.

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 1220654441 - 2¹⁴ = 1220638057 is a prime.

It is a super-3 number, since 3×1220654441³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220654443) 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, 9109295 + ... + 9109428.

It is an arithmetic number, because the mean of its divisors is an integer number (309718308).

Almost surely, 2^1220654441 is an apocalyptic number.

It is an amenable number.

1220654441 is a deficient number, since it is larger than the sum of its proper divisors (18218791).

1220654441 is an equidigital number, since it uses as much as digits as its factorization.

1220654441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18218790.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 1220654441 is about 34937.8654327937. The cubic root of 1220654441 is about 1068.7207587453.

The spelling of 1220654441 in words is "one billion, two hundred twenty million, six hundred fifty-four thousand, four hundred forty-one".