1220120747 has 2 divisors, whose sum is σ = 1220120748. Its totient is φ = 1220120746.

The previous prime is 1220120659. The next prime is 1220120749. The reversal of 1220120747 is 7470210221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220120747 - 2²⁰ = 1219072171 is a prime.

Together with 1220120749, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1220120749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610060373 + 610060374.

It is an arithmetic number, because the mean of its divisors is an integer number (610060374).

Almost surely, 2^1220120747 is an apocalyptic number.

1220120747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220120747 is an equidigital number, since it uses as much as digits as its factorization.

1220120747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 1220120747 is about 34930.2268386565. The cubic root of 1220120747 is about 1068.5649808328.

Adding to 1220120747 its reverse (7470210221), we get a palindrome (8690330968).

The spelling of 1220120747 in words is "one billion, two hundred twenty million, one hundred twenty thousand, seven hundred forty-seven".