1220741611 has 4 divisors (see below), whose sum is σ = 1220815672. Its totient is φ = 1220667552.

The previous prime is 1220741603. The next prime is 1220741647. The reversal of 1220741611 is 1161470221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1161470221 = 859 ⋅1352119.

It is a cyclic number.

It is not a de Polignac number, because 1220741611 - 2³ = 1220741603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220741681) 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, 115 + ... + 49411.

It is an arithmetic number, because the mean of its divisors is an integer number (305203918).

Almost surely, 2^1220741611 is an apocalyptic number.

1220741611 is a deficient number, since it is larger than the sum of its proper divisors (74061).

1220741611 is an equidigital number, since it uses as much as digits as its factorization.

1220741611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74060.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1220741611 is about 34939.1129108911. The cubic root of 1220741611 is about 1068.7461981512.

The spelling of 1220741611 in words is "one billion, two hundred twenty million, seven hundred forty-one thousand, six hundred eleven".